[ { "sku": "BMB-6202-032S2-UB008A", "brand": "SKF", "manufacturer_designation": "BMB-6202/032S2/UB008A", "series": "BMB-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 62, "weight_estimated": false, "naming_rule_text": "The load-carrying envelope is a 15 mm bore by 35 mm outside diameter in a 11 mm width, and the catalogue ratings for the bearing inside are C 7.8 kN, C0 3.75 kN and Pu 0.16 kN. Two 90°-shifted output signals at 32 pulses per revolution, period accuracy ±3% and phase tolerance ±30°; the maximum mechanical speed is 13000 r/min. The C/C0 ratio of 2.08 is typical of a sensor bearing unit that shares the ordinary bearing raceway with the encoder track, so radial loads are carried by the same rolling elements that position the sensor ring. The unit weighs 62 g over its 15/35/11 mm envelope and ships with a 525 mm cable terminating in a free cable end; within this 32-pulse size the connector is the sole electrical option. The 32-pulse output reaches 6933.333 Hz per channel at the 13000 r/min mechanical limit, equivalent to 11.25° of rotation per pulse, so the receiver must be able to accept that bandwidth. with a 15 mm bore this is a small sensor bearing unit; the 35 mm outside diameter keeps the housing bore within ordinary machined tolerances BMB-6206/064S2 style designations are decoded as bearing code, pulse block and interface block — the /064 is not a part number but the number of pulses per revolution, and S2 confirms two output channels. The trailing 008A marks the free cable end variant, supplied as a plain cable tail for the customer to terminate; it is the shorter-cable option of the pair. The U/B block means a glass-fibre reinforced PA66 ball cage, chosen for quiet running and resistance to the temperature swings of a rotor-mounted unit. typical applications include wind turbine yaw and pitch feedback, machine-tool spindle position monitoring and industrial automation axis control this unit is commonly specified for wind turbine yaw and pitch feedback and machine-tool spindle position monitoring, where rotor position and speed sensing with a 32-pulse signal fits the controller's input in industrial automation axis control the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 62 g mass keeps the rotating inertia low the embedded bearing shares its grease charge with the sensor assembly, so both the lubricant specification and the temperature range must be respected together mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "applications": [ "packaging machine index cams", "wind turbine yaw and pitch feedback", "elevator drive traction monitoring", "steer-by-wire hand-wheel input" ], "failure_modes": [ "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "the embedded bearing shares its grease charge with the sensor assembly, so both the lubricant specification and the temperature range must be respected together", "mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal", "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together" ], "pitfalls": [ "the embedded bearing shares its grease charge with the sensor assembly, so both the lubricant specification and the temperature range must be respected together", "mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal", "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N" ], "faq": [ { "q": "What does the BMB designation mean?", "a": "BMB identifies a motor encoder unit that mounts directly on the rotor. The full designation BMB-6202/032S2/UB008A carries the pulse count, the two-signal configuration, the sales region, the cage material and the electrical interface, so the complete specification follows from the code." }, { "q": "What is the resolution of the BMB-6202-032S2-UB008A?", "a": "The unit outputs 32 pulses per revolution as two phase-shifted signals, with a period accuracy of ±3% and a nominal phase shift of 90° within ±30°." }, { "q": "Which bearing is inside the BMB-6202-032S2-UB008A?", "a": "The unit is built on a 6202 deep groove ball bearing of the 15/35/11 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "How is the BMB-6202-032S2-UB008A connected?", "a": "The unit is supplied with a free cable end and a 525 mm cable, outputting two 32-pulse signals. Fix the connector and cable variant at order time — the alternatives are not field-interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-6202-032S2-UB008A", "BMB-6202/032S2/UB008A" ], "locale_variants": {}, "d_mm": 15, "D_mm": 35, "B_mm": 11, "dynamic_load_kN": 7.8, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "cage_type": "polymer_PA66", "pulses_per_rev": 32, "period_accuracy_pct": 3, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 525, "connector_type": "free_cable_end", "limiting_speed_rpm": 13000, "max_rpm": 13000 }, { "sku": "BMB-6202-032S2-UB108A", "brand": "SKF", "manufacturer_designation": "BMB-6202/032S2/UB108A", "series": "BMB-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 70, "weight_estimated": false, "naming_rule_text": "A 11 mm wide unit on a 15 mm bore with a 35 mm outside diameter; the deep groove ball raceway beneath the sensor track is rated C 7.8 kN dynamic and C0 3.75 kN static, with a fatigue load limit of Pu 0.16 kN. On the signal side the unit resolves 32 pulses per revolution with ±3% period accuracy and a 90° phase shift between its two channels, tolerated to ±30°; the bearing sets a mechanical limit of 13000 r/min. With C0 at 3.75 kN against C 7.8 kN the ratio works out to 2.08, the signature of a unit whose encoder track leaves the bearing raceway unchanged — the rolling elements do double duty as the position reference. Density of the design: a 15/35/11 mm envelope at 70 g, with a 550 mm cable and a AMP Superseal connector — the connector choice is the only electrical variant across the 32-pulse row. Each output pulse corresponds to 11.25° of rotation, and at the 13000 r/min limit the channel frequency is 6933.333 Hz — a figure to match against the receiver's input rating. the 15 mm bore places this in the small end of the range, where the compact rotor-mounted envelope suits light shafts and tight bearing seats BMB names a motor encoder unit built on a B-series deep groove ball bearing: the digits after the prefix repeat the embedded bearing size (6202), then /032S2 gives the two-signal pulse count, U the worldwide sales region, the cage letter A or B the ball-cage material, and the final connector block the electrical interface. The trailing 108A marks the AMP Superseal connector variant, the plug-and-play interface used where a sealed automotive connector is required; the cable is 5 mm longer than the free-end version of the same size. The U/B block means a glass-fibre reinforced PA66 ball cage, chosen for quiet running and resistance to the temperature swings of a rotor-mounted unit. typical applications include conveyor pulley speed and direction sensing, pump and fan rotor speed feedback and electric drive commutation and speed control this unit is commonly specified for conveyor pulley speed and direction sensing and pump and fan rotor speed feedback, where rotor position and speed sensing with a 32-pulse signal fits the controller's input in electric drive commutation and speed control the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 70 g mass keeps the rotating inertia low the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "applications": [ "agricultural machinery rotor position sensing", "conveyor pulley speed and direction sensing", "servo motor rotor feedback", "textile spindle speed control" ], "failure_modes": [ "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail" ], "pitfalls": [ "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses" ], "faq": [ { "q": "What does the BMB designation mean?", "a": "In the BMB scheme a motor encoder unit that mounts directly on the rotor is encoded as BMB-6202/032S2/UB108A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the BMB-6202-032S2-UB108A?", "a": "Resolution is 32 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±3%, with the phase nominally 90° and held within ±30°." }, { "q": "Which bearing is inside the BMB-6202-032S2-UB108A?", "a": "The unit is built on a 6202 deep groove ball bearing of the 15/35/11 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What cable and connector are fitted to the BMB-6202-032S2-UB108A?", "a": "Connection is by an AMP Superseal connector on a 550 mm lead, carrying two 32-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-6202-032S2-UB108A", "BMB-6202/032S2/UB108A" ], "locale_variants": {}, "d_mm": 15, "D_mm": 35, "B_mm": 11, "dynamic_load_kN": 7.8, "static_load_kN": 3.75, "fatigue_load_limit_kN": 0.16, "cage_type": "polymer_PA66", "pulses_per_rev": 32, "period_accuracy_pct": 3, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 550, "connector_type": "amp_superseal", "limiting_speed_rpm": 13000, "max_rpm": 13000 }, { "sku": "BMO-6204-048S2-UA008A", "brand": "SKF", "manufacturer_designation": "BMO-6204/048S2/UA008A", "series": "BMO-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 130, "weight_estimated": false, "naming_rule_text": "Dimensionally the unit is 20/47/14 mm: the embedded deep groove ball bearing carries the load path and the sensor ring shares that same bore envelope; basic ratings are C 12.7 kN dynamic and C0 6.55 kN static, with a fatigue load limit of Pu 0.28 kN. Rated 48 pulses per revolution at a period accuracy of ±3%, the unit outputs two 90°-shifted signals held within ±20°; the mechanical limiting speed is 10000 r/min. A 1.939 static-to-dynamic load ratio confirms this is a genuine bearing unit rather than a bearing with a separate magnetic ring: C0 6.55 kN and C 12.7 kN are the standard ratings for this ISO 15 envelope. 130 g on a 20x47x14 mm envelope, fitted with a 535 mm lead and a free cable end. Across the 48-pulse size the plug type is the only electrical difference. Running to its 10000 r/min limit the 48-pulse channel emits 8000 Hz, one pulse per 7.5° of shaft turn — confirm the controller's maximum input frequency is not exceeded. the 20 mm bore places this in the small end of the range, where the compact rotor-mounted envelope suits light shafts and tight bearing seats BMO names a motor encoder unit built on a thin-section deep groove ball bearing for compact rotors: the digits after the prefix repeat the embedded bearing size (6204), then /048S2 gives the two-signal pulse count, U the worldwide sales region, the cage letter A or B the ball-cage material, and the final connector block the electrical interface. The trailing 008A marks the free cable end variant, supplied as a plain cable tail for the customer to terminate; it is the shorter-cable option of the pair. The U/A block means a stamped steel ball cage, standard for the sizes where the higher load ratings rule out a polymer cage. typical applications include electric drive commutation and speed control, automotive electric power steering and medical equipment rotary positioning this unit is commonly specified for electric drive commutation and speed control and automotive electric power steering, where rotor position and speed sensing with a 48-pulse signal fits the controller's input in medical equipment rotary positioning the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 130 g mass keeps the rotating inertia low the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "applications": [ "textile spindle speed control", "electric drive commutation and speed control", "wind turbine yaw and pitch feedback", "machine-tool spindle position monitoring" ], "failure_modes": [ "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the unit is a bearing first: mounting with the sensor face under axial preload distorts the track and shifts the signal timing away from the calculated phase", "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable" ], "pitfalls": [ "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal" ], "faq": [ { "q": "What does the BMO prefix stand for?", "a": "In the BMO scheme a motor encoder unit that mounts directly on the rotor is encoded as BMO-6204/048S2/UA008A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What angular resolution does the BMO-6204-048S2-UA008A give?", "a": "Resolution is 48 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±3%, with the phase nominally 90° and held within ±20°." }, { "q": "Which bearing is inside the BMO-6204-048S2-UA008A?", "a": "The unit is built on a 6204 deep groove ball bearing of the 20/47/14 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMO-6204-048S2-UA008A use?", "a": "Connection is by a free cable end on a 535 mm lead, carrying two 48-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMO-6204-048S2-UA008A", "BMO-6204/048S2/UA008A" ], "locale_variants": {}, "d_mm": 20, "D_mm": 47, "B_mm": 14, "dynamic_load_kN": 12.7, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "cage_type": "steel_stamped_J", "pulses_per_rev": 48, "period_accuracy_pct": 3, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 20, "cable_length_mm": 535, "connector_type": "free_cable_end", "limiting_speed_rpm": 10000, "max_rpm": 10000 }, { "sku": "BMO-6204-048S2-UA108A", "brand": "SKF", "manufacturer_designation": "BMO-6204/048S2/UA108A", "series": "BMO-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 140, "weight_estimated": false, "naming_rule_text": "The 20 mm bore and 47 mm outside diameter carry the deep groove ball raceway while the 14 mm width houses the sensor ring; the published ratings are C 12.7 kN, C0 6.55 kN and a fatigue load limit Pu 0.28 kN. The encoder delivers 48 pulses per revolution as two output channels 90° apart, each pulse period accurate to ±3% and the phase held to within ±20°; limiting speed 10000 r/min. Because the sensor ring does not alter the ball raceway, the static-to-dynamic ratio stays at 1.939 (6.55 kN against 12.7 kN), matching the plain bearing of this size. Physically the unit is a 20/47/14 mm, 140 g assembly with a 560 mm cable ending in a AMP Superseal connector; the 48-pulse electronics are otherwise fixed for the size. At the 10000 r/min limiting speed the 48-pulse track produces 8000 Hz per channel, i.e. 7.5° of shaft rotation per output pulse; check the receiving controller's input frequency range against that figure. with a 20 mm bore this is a small sensor bearing unit; the 47 mm outside diameter keeps the housing bore within ordinary machined tolerances BMO-6206/064S2 style designations are decoded as bearing code, pulse block and interface block — the /064 is not a part number but the number of pulses per revolution, and S2 confirms two output channels. The trailing 108A marks the AMP Superseal connector variant, the plug-and-play interface used where a sealed automotive connector is required; the cable is 5 mm longer than the free-end version of the same size. The U/A block means a stamped steel ball cage, standard for the sizes where the higher load ratings rule out a polymer cage. typical applications include industrial automation axis control, conveyor pulley speed and direction sensing and pump and fan rotor speed feedback this unit is commonly specified for industrial automation axis control and conveyor pulley speed and direction sensing, where rotor position and speed sensing with a 48-pulse signal fits the controller's input in pump and fan rotor speed feedback the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 140 g mass keeps the rotating inertia low the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal", "applications": [ "steer-by-wire hand-wheel input", "industrial automation axis control", "agricultural machinery rotor position sensing", "servo motor rotor feedback" ], "failure_modes": [ "mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "the embedded bearing shares its grease charge with the sensor assembly, so both the lubricant specification and the temperature range must be respected together", "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N" ], "pitfalls": [ "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal" ], "faq": [ { "q": "What does the BMO prefix stand for?", "a": "BMO identifies a motor encoder unit that mounts directly on the rotor. The full designation BMO-6204/048S2/UA108A carries the pulse count, the two-signal configuration, the sales region, the cage material and the electrical interface, so the complete specification follows from the code." }, { "q": "What is the resolution of the BMO-6204-048S2-UA108A?", "a": "The unit outputs 48 pulses per revolution as two phase-shifted signals, with a period accuracy of ±3% and a nominal phase shift of 90° within ±20°." }, { "q": "Which bearing is inside the BMO-6204-048S2-UA108A?", "a": "The unit is built on a 6204 deep groove ball bearing of the 20/47/14 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMO-6204-048S2-UA108A use?", "a": "The unit is supplied with an AMP Superseal connector and a 560 mm cable, outputting two 48-pulse signals. Fix the connector and cable variant at order time — the alternatives are not field-interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMO-6204-048S2-UA108A", "BMO-6204/048S2/UA108A" ], "locale_variants": {}, "d_mm": 20, "D_mm": 47, "B_mm": 14, "dynamic_load_kN": 12.7, "static_load_kN": 6.55, "fatigue_load_limit_kN": 0.28, "cage_type": "steel_stamped_J", "pulses_per_rev": 48, "period_accuracy_pct": 3, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 20, "cable_length_mm": 560, "connector_type": "amp_superseal", "limiting_speed_rpm": 10000, "max_rpm": 10000 }, { "sku": "BMO-6205-048S2-UA008A", "brand": "SKF", "manufacturer_designation": "BMO-6205/048S2/UA008A", "series": "BMO-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 160, "weight_estimated": false, "naming_rule_text": "The 25 mm bore and 52 mm outside diameter carry the deep groove ball raceway while the 15 mm width houses the sensor ring; the published ratings are C 14 kN, C0 7.8 kN and a fatigue load limit Pu 0.335 kN. The encoder delivers 48 pulses per revolution as two output channels 90° apart, each pulse period accurate to ±3% and the phase held to within ±30°; limiting speed 8500 r/min. Because the sensor ring does not alter the ball raceway, the static-to-dynamic ratio stays at 1.795 (7.8 kN against 14 kN), matching the plain bearing of this size. Physically the unit is a 25/52/15 mm, 160 g assembly with a 535 mm cable ending in a free cable end; the 48-pulse electronics are otherwise fixed for the size. At the 8500 r/min limiting speed the 48-pulse track produces 6800 Hz per channel, i.e. 7.5° of shaft rotation per output pulse; check the receiving controller's input frequency range against that figure. at 25 mm bore this size balances load capacity against the compactness needed at the rotor end of a motor shaft reading the BMO stack left to right: the embedded bearing code fixes the ISO 15 boundary dimensions, /048S2 fixes the output as two 48-pulse signals, and the U + cage + connector tail describes region, cage material and plug. The 008A tail means a free cable end: a plain unterminated lead for the customer to fit their own connector, and the shorter cable of the two options. The U/A block is a stamped steel ball cage, the standard choice at sizes whose load ratings are too high for a polymer cage. typical applications include servo motor rotor feedback, textile spindle speed control and wind turbine yaw and pitch feedback this unit is commonly specified for servo motor rotor feedback and textile spindle speed control, where rotor position and speed sensing with a 48-pulse signal fits the controller's input in wind turbine yaw and pitch feedback the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 160 g mass keeps the rotating inertia low the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal", "applications": [ "robotic joint position feedback", "servo motor rotor feedback", "crane and hoist position limiting", "packaging machine index cams" ], "failure_modes": [ "mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "the embedded bearing shares its grease charge with the sensor assembly, so both the lubricant specification and the temperature range must be respected together", "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N" ], "pitfalls": [ "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "mounting the unit on a rotor with excessive unbalance or axial play loads the sensor ring unevenly and shows up as a periodic error in the signal" ], "faq": [ { "q": "How is the BMO part number structured?", "a": "BMO identifies a motor encoder unit that mounts directly on the rotor. The full designation BMO-6205/048S2/UA008A carries the pulse count, the two-signal configuration, the sales region, the cage material and the electrical interface, so the complete specification follows from the code." }, { "q": "What is the resolution of the BMO-6205-048S2-UA008A?", "a": "The unit outputs 48 pulses per revolution as two phase-shifted signals, with a period accuracy of ±3% and a nominal phase shift of 90° within ±30°." }, { "q": "Which bearing is inside the BMO-6205-048S2-UA008A?", "a": "The unit is built on a 6205 deep groove ball bearing of the 25/52/15 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What cable and connector are fitted to the BMO-6205-048S2-UA008A?", "a": "The unit is supplied with a free cable end and a 535 mm cable, outputting two 48-pulse signals. Fix the connector and cable variant at order time — the alternatives are not field-interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMO-6205-048S2-UA008A", "BMO-6205/048S2/UA008A" ], "locale_variants": {}, "d_mm": 25, "D_mm": 52, "B_mm": 15, "dynamic_load_kN": 14, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "cage_type": "steel_stamped_J", "pulses_per_rev": 48, "period_accuracy_pct": 3, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 535, "connector_type": "free_cable_end", "limiting_speed_rpm": 8500, "max_rpm": 8500 }, { "sku": "BMO-6205-048S2-UA108A", "brand": "SKF", "manufacturer_designation": "BMO-6205/048S2/UA108A", "series": "BMO-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 170, "weight_estimated": false, "naming_rule_text": "Dimensionally the unit is 25/52/15 mm: the embedded deep groove ball bearing carries the load path and the sensor ring shares that same bore envelope; basic ratings are C 14 kN dynamic and C0 7.8 kN static, with a fatigue load limit of Pu 0.335 kN. Rated 48 pulses per revolution at a period accuracy of ±3%, the unit outputs two 90°-shifted signals held within ±30°; the mechanical limiting speed is 8500 r/min. A 1.795 static-to-dynamic load ratio confirms this is a genuine bearing unit rather than a bearing with a separate magnetic ring: C0 7.8 kN and C 14 kN are the standard ratings for this ISO 15 envelope. 170 g on a 25x52x15 mm envelope, fitted with a 560 mm lead and a AMP Superseal connector. Across the 48-pulse size the plug type is the only electrical difference. Running to its 8500 r/min limit the 48-pulse channel emits 6800 Hz, one pulse per 7.5° of shaft turn — confirm the controller's maximum input frequency is not exceeded. mid-range at 25 mm bore, this unit fits the widest span of standard motor shaft ends without special housing work take the BMO designation in three blocks: bearing size (6205), the /048S2 two-signal pulse count, and the U-plus-cage-plus-connector interface tail. The trailing 108A marks the AMP Superseal connector variant, the plug-and-play interface used where a sealed automotive connector is required; the cable is 5 mm longer than the free-end version of the same size. The U/A block means a stamped steel ball cage, standard for the sizes where the higher load ratings rule out a polymer cage. typical applications include machine-tool spindle position monitoring, industrial automation axis control and conveyor pulley speed and direction sensing this unit is commonly specified for machine-tool spindle position monitoring and industrial automation axis control, where rotor position and speed sensing with a 48-pulse signal fits the controller's input in conveyor pulley speed and direction sensing the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 170 g mass keeps the rotating inertia low the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "applications": [ "elevator drive traction monitoring", "machine-tool spindle position monitoring", "steer-by-wire hand-wheel input", "agricultural machinery rotor position sensing" ], "failure_modes": [ "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses" ], "pitfalls": [ "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal" ], "faq": [ { "q": "How is the BMO part number structured?", "a": "In the BMO scheme a motor encoder unit that mounts directly on the rotor is encoded as BMO-6205/048S2/UA108A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the BMO-6205-048S2-UA108A?", "a": "Resolution is 48 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±3%, with the phase nominally 90° and held within ±30°." }, { "q": "Which bearing is inside the BMO-6205-048S2-UA108A?", "a": "The unit is built on a 6205 deep groove ball bearing of the 25/52/15 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMO-6205-048S2-UA108A use?", "a": "Connection is by an AMP Superseal connector on a 560 mm lead, carrying two 48-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMO-6205-048S2-UA108A", "BMO-6205/048S2/UA108A" ], "locale_variants": {}, "d_mm": 25, "D_mm": 52, "B_mm": 15, "dynamic_load_kN": 14, "static_load_kN": 7.8, "fatigue_load_limit_kN": 0.335, "cage_type": "steel_stamped_J", "pulses_per_rev": 48, "period_accuracy_pct": 3, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 560, "connector_type": "amp_superseal", "limiting_speed_rpm": 8500, "max_rpm": 8500 }, { "sku": "BMD-6206-064S2-UA008A", "brand": "SKF", "manufacturer_designation": "BMD-6206/064S2/UA008A", "series": "BMD-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 220, "weight_estimated": false, "naming_rule_text": "The 30 mm bore and 62 mm outside diameter carry the deep groove ball raceway while the 16 mm width houses the sensor ring; the published ratings are C 19.5 kN, C0 11.2 kN and a fatigue load limit Pu 0.475 kN. The encoder delivers 64 pulses per revolution as two output channels 90° apart, each pulse period accurate to ±4% and the phase held to within ±30°; limiting speed 7500 r/min. Because the sensor ring does not alter the ball raceway, the static-to-dynamic ratio stays at 1.741 (11.2 kN against 19.5 kN), matching the plain bearing of this size. Physically the unit is a 30/62/16 mm, 220 g assembly with a 540 mm cable ending in a free cable end; the 64-pulse electronics are otherwise fixed for the size. At the 7500 r/min limiting speed the 64-pulse track produces 8000 Hz per channel, i.e. 5.625° of shaft rotation per output pulse; check the receiving controller's input frequency range against that figure. with a 30 mm bore and 62 mm outside diameter this is a medium-size unit, suitable for standard shaft ends without custom housings BMD-6206/064S2 style designations are decoded as bearing code, pulse block and interface block — the /064 is not a part number but the number of pulses per revolution, and S2 confirms two output channels. The trailing 008A marks the free cable end variant, supplied as a plain cable tail for the customer to terminate; it is the shorter-cable option of the pair. The U/A block means a stamped steel ball cage, standard for the sizes where the higher load ratings rule out a polymer cage. typical applications include servo motor rotor feedback, textile spindle speed control and wind turbine yaw and pitch feedback this unit is commonly specified for servo motor rotor feedback and textile spindle speed control, where rotor position and speed sensing with a 64-pulse signal fits the controller's input in wind turbine yaw and pitch feedback the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 220 g mass keeps the rotating inertia low the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "applications": [ "steer-by-wire hand-wheel input", "servo motor rotor feedback", "agricultural machinery rotor position sensing", "textile spindle speed control" ], "failure_modes": [ "the unit is a bearing first: mounting with the sensor face under axial preload distorts the track and shifts the signal timing away from the calculated phase", "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail", "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces" ], "pitfalls": [ "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail", "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together" ], "faq": [ { "q": "What does the BMD prefix stand for?", "a": "BMD identifies a motor encoder unit that mounts directly on the rotor. The full designation BMD-6206/064S2/UA008A carries the pulse count, the two-signal configuration, the sales region, the cage material and the electrical interface, so the complete specification follows from the code." }, { "q": "How many pulses per revolution does the BMD-6206-064S2-UA008A deliver?", "a": "The unit outputs 64 pulses per revolution as two phase-shifted signals, with a period accuracy of ±4% and a nominal phase shift of 90° within ±30°." }, { "q": "Which bearing is inside the BMD-6206-064S2-UA008A?", "a": "The unit is built on a 6206 deep groove ball bearing of the 30/62/16 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMD-6206-064S2-UA008A use?", "a": "The unit is supplied with a free cable end and a 540 mm cable, outputting two 64-pulse signals. Fix the connector and cable variant at order time — the alternatives are not field-interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMD-6206-064S2-UA008A", "BMD-6206/064S2/UA008A" ], "locale_variants": {}, "d_mm": 30, "D_mm": 62, "B_mm": 16, "dynamic_load_kN": 19.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "cage_type": "steel_stamped_J", "pulses_per_rev": 64, "period_accuracy_pct": 4, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 540, "connector_type": "free_cable_end", "limiting_speed_rpm": 7500, "max_rpm": 7500 }, { "sku": "BMD-6206-064S2-UA108A", "brand": "SKF", "manufacturer_designation": "BMD-6206/064S2/UA108A", "series": "BMD-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 240, "weight_estimated": false, "naming_rule_text": "Dimensionally the unit is 30/62/16 mm: the embedded deep groove ball bearing carries the load path and the sensor ring shares that same bore envelope; basic ratings are C 19.5 kN dynamic and C0 11.2 kN static, with a fatigue load limit of Pu 0.475 kN. Rated 64 pulses per revolution at a period accuracy of ±4%, the unit outputs two 90°-shifted signals held within ±30°; the mechanical limiting speed is 7500 r/min. A 1.741 static-to-dynamic load ratio confirms this is a genuine bearing unit rather than a bearing with a separate magnetic ring: C0 11.2 kN and C 19.5 kN are the standard ratings for this ISO 15 envelope. 240 g on a 30x62x16 mm envelope, fitted with a 565 mm lead and a AMP Superseal connector. Across the 64-pulse size the plug type is the only electrical difference. Running to its 7500 r/min limit the 64-pulse channel emits 8000 Hz, one pulse per 5.625° of shaft turn — confirm the controller's maximum input frequency is not exceeded. at 30 mm bore this size balances load capacity against the compactness needed at the rotor end of a motor shaft reading the BMD stack left to right: the embedded bearing code fixes the ISO 15 boundary dimensions, /064S2 fixes the output as two 64-pulse signals, and the U + cage + connector tail describes region, cage material and plug. The 108A tail is the AMP Superseal connector option — a sealed automotive-grade plug chosen where the wiring harness needs a keyed, water-resistant interface, and its lead runs 5 mm longer than the free-end alternative. The U/A block is a stamped steel ball cage, the standard choice at sizes whose load ratings are too high for a polymer cage. typical applications include machine-tool spindle position monitoring, industrial automation axis control and conveyor pulley speed and direction sensing this unit is commonly specified for machine-tool spindle position monitoring and industrial automation axis control, where rotor position and speed sensing with a 64-pulse signal fits the controller's input in conveyor pulley speed and direction sensing the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 240 g mass keeps the rotating inertia low the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "applications": [ "textile spindle speed control", "machine-tool spindle position monitoring", "wind turbine yaw and pitch feedback", "industrial automation axis control" ], "failure_modes": [ "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the unit is a bearing first: mounting with the sensor face under axial preload distorts the track and shifts the signal timing away from the calculated phase", "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable" ], "pitfalls": [ "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal" ], "faq": [ { "q": "What does the BMD prefix stand for?", "a": "In the BMD scheme a motor encoder unit that mounts directly on the rotor is encoded as BMD-6206/064S2/UA108A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What angular resolution does the BMD-6206-064S2-UA108A give?", "a": "Resolution is 64 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±4%, with the phase nominally 90° and held within ±30°." }, { "q": "Which bearing is inside the BMD-6206-064S2-UA108A?", "a": "The unit is built on a 6206 deep groove ball bearing of the 30/62/16 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMD-6206-064S2-UA108A use?", "a": "Connection is by an AMP Superseal connector on a 565 mm lead, carrying two 64-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMD-6206-064S2-UA108A", "BMD-6206/064S2/UA108A" ], "locale_variants": {}, "d_mm": 30, "D_mm": 62, "B_mm": 16, "dynamic_load_kN": 19.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "cage_type": "steel_stamped_J", "pulses_per_rev": 64, "period_accuracy_pct": 4, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 565, "connector_type": "amp_superseal", "limiting_speed_rpm": 7500, "max_rpm": 7500 }, { "sku": "BMB-6208-080S2-UB008A", "brand": "SKF", "manufacturer_designation": "BMB-6208/080S2/UB008A", "series": "BMB-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 450, "weight_estimated": false, "naming_rule_text": "A 18 mm wide unit on a 40 mm bore with a 80 mm outside diameter; the deep groove ball raceway beneath the sensor track is rated C 30.7 kN dynamic and C0 19 kN static, with a fatigue load limit of Pu 0.8 kN. On the signal side the unit resolves 80 pulses per revolution with ±5% period accuracy and a 90° phase shift between its two channels, tolerated to ±30°; the bearing sets a mechanical limit of 5600 r/min. With C0 at 19 kN against C 30.7 kN the ratio works out to 1.616, the signature of a unit whose encoder track leaves the bearing raceway unchanged — the rolling elements do double duty as the position reference. Density of the design: a 40/80/18 mm envelope at 450 g, with a 545 mm cable and a free cable end — the connector choice is the only electrical variant across the 80-pulse row. Each output pulse corresponds to 4.5° of rotation, and at the 5600 r/min limit the channel frequency is 7466.667 Hz — a figure to match against the receiver's input rating. at 40 mm bore this size trades the family's compactness for load capacity and a larger 80 mm sensing ring take the BMB designation in three blocks: bearing size (6208), the /080S2 two-signal pulse count, and the U-plus-cage-plus-connector interface tail. The trailing 008A marks the free cable end variant, supplied as a plain cable tail for the customer to terminate; it is the shorter-cable option of the pair. The U/B block means a glass-fibre reinforced PA66 ball cage, chosen for quiet running and resistance to the temperature swings of a rotor-mounted unit. typical applications include medical equipment rotary positioning, robotic joint position feedback and crane and hoist position limiting this unit is commonly specified for medical equipment rotary positioning and robotic joint position feedback, where rotor position and speed sensing with a 80-pulse signal fits the controller's input in crane and hoist position limiting the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 450 g mass keeps the rotating inertia low period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "applications": [ "agricultural machinery rotor position sensing", "medical equipment rotary positioning", "servo motor rotor feedback", "textile spindle speed control" ], "failure_modes": [ "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable", "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail" ], "pitfalls": [ "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly" ], "faq": [ { "q": "What does the BMB prefix stand for?", "a": "In the BMB scheme a motor encoder unit that mounts directly on the rotor is encoded as BMB-6208/080S2/UB008A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the BMB-6208-080S2-UB008A?", "a": "Resolution is 80 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±5%, with the phase nominally 90° and held within ±30°." }, { "q": "Which bearing is inside the BMB-6208-080S2-UB008A?", "a": "The unit is built on a 6208 deep groove ball bearing of the 40/80/18 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What cable and connector are fitted to the BMB-6208-080S2-UB008A?", "a": "Connection is by a free cable end on a 545 mm lead, carrying two 80-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-6208-080S2-UB008A", "BMB-6208/080S2/UB008A" ], "locale_variants": {}, "d_mm": 40, "D_mm": 80, "B_mm": 18, "dynamic_load_kN": 30.7, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "cage_type": "polymer_PA66", "pulses_per_rev": 80, "period_accuracy_pct": 5, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 545, "connector_type": "free_cable_end", "limiting_speed_rpm": 5600, "max_rpm": 5600 }, { "sku": "BMB-6208-080S2-UB108A", "brand": "SKF", "manufacturer_designation": "BMB-6208/080S2/UB108A", "series": "BMB-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 460, "weight_estimated": false, "naming_rule_text": "The load-carrying envelope is a 40 mm bore by 80 mm outside diameter in a 18 mm width, and the catalogue ratings for the bearing inside are C 30.7 kN, C0 19 kN and Pu 0.8 kN. Two 90°-shifted output signals at 80 pulses per revolution, period accuracy ±5% and phase tolerance ±30°; the maximum mechanical speed is 5600 r/min. The C/C0 ratio of 1.616 is typical of a sensor bearing unit that shares the ordinary bearing raceway with the encoder track, so radial loads are carried by the same rolling elements that position the sensor ring. The unit weighs 460 g over its 40/80/18 mm envelope and ships with a 570 mm cable terminating in a AMP Superseal connector; within this 80-pulse size the connector is the sole electrical option. The 80-pulse output reaches 7466.667 Hz per channel at the 5600 r/min mechanical limit, equivalent to 4.5° of rotation per pulse, so the receiver must be able to accept that bandwidth. at 40 mm bore the unit is sized for heavier shafts, and the correspondingly larger sensor ring raises the mass and the drive inertia reading the BMB stack left to right: the embedded bearing code fixes the ISO 15 boundary dimensions, /080S2 fixes the output as two 80-pulse signals, and the U + cage + connector tail describes region, cage material and plug. The 108A tail is the AMP Superseal connector option — a sealed automotive-grade plug chosen where the wiring harness needs a keyed, water-resistant interface, and its lead runs 5 mm longer than the free-end alternative. A U/B block specifies a glass-fibre reinforced PA66 ball cage — quieter than steel and better able to absorb the thermal cycling a rotor-mounted encoder sees. typical applications include pump and fan rotor speed feedback, electric drive commutation and speed control and automotive electric power steering this unit is commonly specified for pump and fan rotor speed feedback and electric drive commutation and speed control, where rotor position and speed sensing with a 80-pulse signal fits the controller's input in automotive electric power steering the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 460 g mass keeps the rotating inertia low the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "applications": [ "packaging machine index cams", "pump and fan rotor speed feedback", "elevator drive traction monitoring", "steer-by-wire hand-wheel input" ], "failure_modes": [ "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "the unit is a bearing first: mounting with the sensor face under axial preload distorts the track and shifts the signal timing away from the calculated phase" ], "pitfalls": [ "the patterned sensor track is sensitive to contamination; a recessed or poorly sealed mounting face lets debris interrupt individual pulses", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal" ], "faq": [ { "q": "What does the BMB prefix stand for?", "a": "BMB identifies a motor encoder unit that mounts directly on the rotor. The full designation BMB-6208/080S2/UB108A carries the pulse count, the two-signal configuration, the sales region, the cage material and the electrical interface, so the complete specification follows from the code." }, { "q": "How many pulses per revolution does the BMB-6208-080S2-UB108A deliver?", "a": "The unit outputs 80 pulses per revolution as two phase-shifted signals, with a period accuracy of ±5% and a nominal phase shift of 90° within ±30°." }, { "q": "Which bearing is inside the BMB-6208-080S2-UB108A?", "a": "The unit is built on a 6208 deep groove ball bearing of the 40/80/18 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMB-6208-080S2-UB108A use?", "a": "The unit is supplied with an AMP Superseal connector and a 570 mm cable, outputting two 80-pulse signals. Fix the connector and cable variant at order time — the alternatives are not field-interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-6208-080S2-UB108A", "BMB-6208/080S2/UB108A" ], "locale_variants": {}, "d_mm": 40, "D_mm": 80, "B_mm": 18, "dynamic_load_kN": 30.7, "static_load_kN": 19, "fatigue_load_limit_kN": 0.8, "cage_type": "polymer_PA66", "pulses_per_rev": 80, "period_accuracy_pct": 5, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 570, "connector_type": "amp_superseal", "limiting_speed_rpm": 5600, "max_rpm": 5600 }, { "sku": "BMB-6209-080S2-UB008A", "brand": "SKF", "manufacturer_designation": "BMB-6209/080S2/UB008A", "series": "BMB-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 540, "weight_estimated": false, "naming_rule_text": "The load-carrying envelope is a 45 mm bore by 85 mm outside diameter in a 19 mm width, and the catalogue ratings for the bearing inside are C 33.2 kN, C0 21.6 kN and Pu 0.915 kN. Two 90°-shifted output signals at 80 pulses per revolution, period accuracy ±5% and phase tolerance ±30°; the maximum mechanical speed is 5000 r/min. The C/C0 ratio of 1.537 is typical of a sensor bearing unit that shares the ordinary bearing raceway with the encoder track, so radial loads are carried by the same rolling elements that position the sensor ring. The unit weighs 540 g over its 45/85/19 mm envelope and ships with a 545 mm cable terminating in a free cable end; within this 80-pulse size the connector is the sole electrical option. The 80-pulse output reaches 6666.667 Hz per channel at the 5000 r/min mechanical limit, equivalent to 4.5° of rotation per pulse, so the receiver must be able to accept that bandwidth. the 45 mm bore marks the heavier end of the family, where the 85 mm outside diameter and 540 g mass become design factors in their own right the BMB prefix is only the family tag; the load-carrying envelope comes from the embedded deep groove ball code, so a BMB-6209/080S2/UB008A behaves dimensionally exactly like that bearing size. The 008A tail means a free cable end: a plain unterminated lead for the customer to fit their own connector, and the shorter cable of the two options. A U/B block specifies a glass-fibre reinforced PA66 ball cage — quieter than steel and better able to absorb the thermal cycling a rotor-mounted encoder sees. typical applications include robotic joint position feedback, crane and hoist position limiting and packaging machine index cams this unit is commonly specified for robotic joint position feedback and crane and hoist position limiting, where rotor position and speed sensing with a 80-pulse signal fits the controller's input in packaging machine index cams the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 540 g mass keeps the rotating inertia low the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "applications": [ "servo motor rotor feedback", "robotic joint position feedback", "textile spindle speed control", "wind turbine yaw and pitch feedback" ], "failure_modes": [ "period accuracy is quoted as a percentage of one pulse period — the absolute angular error grows as the pulse count falls, so compare units at equal N", "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the output is a two-channel signal; reversing the channel polarity swaps the direction-of-rotation information even though the unit still counts correctly", "the unit is a bearing first: mounting with the sensor face under axial preload distorts the track and shifts the signal timing away from the calculated phase" ], "pitfalls": [ "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces" ], "faq": [ { "q": "How is the BMB part number structured?", "a": "BMB identifies a motor encoder unit that mounts directly on the rotor. The full designation BMB-6209/080S2/UB008A carries the pulse count, the two-signal configuration, the sales region, the cage material and the electrical interface, so the complete specification follows from the code." }, { "q": "How many pulses per revolution does the BMB-6209-080S2-UB008A deliver?", "a": "The unit outputs 80 pulses per revolution as two phase-shifted signals, with a period accuracy of ±5% and a nominal phase shift of 90° within ±30°." }, { "q": "Which bearing is inside the BMB-6209-080S2-UB008A?", "a": "The unit is built on a 6209 deep groove ball bearing of the 45/85/19 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What cable and connector are fitted to the BMB-6209-080S2-UB008A?", "a": "The unit is supplied with a free cable end and a 545 mm cable, outputting two 80-pulse signals. Fix the connector and cable variant at order time — the alternatives are not field-interchangeable." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-6209-080S2-UB008A", "BMB-6209/080S2/UB008A" ], "locale_variants": {}, "d_mm": 45, "D_mm": 85, "B_mm": 19, "dynamic_load_kN": 33.2, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "cage_type": "polymer_PA66", "pulses_per_rev": 80, "period_accuracy_pct": 5, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 545, "connector_type": "free_cable_end", "limiting_speed_rpm": 5000, "max_rpm": 5000 }, { "sku": "BMB-6209-080S2-UB108A", "brand": "SKF", "manufacturer_designation": "BMB-6209/080S2/UB108A", "series": "BMB-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 540, "weight_estimated": false, "naming_rule_text": "A 19 mm wide unit on a 45 mm bore with a 85 mm outside diameter; the deep groove ball raceway beneath the sensor track is rated C 33.2 kN dynamic and C0 21.6 kN static, with a fatigue load limit of Pu 0.915 kN. On the signal side the unit resolves 80 pulses per revolution with ±5% period accuracy and a 90° phase shift between its two channels, tolerated to ±30°; the bearing sets a mechanical limit of 5000 r/min. With C0 at 21.6 kN against C 33.2 kN the ratio works out to 1.537, the signature of a unit whose encoder track leaves the bearing raceway unchanged — the rolling elements do double duty as the position reference. Density of the design: a 45/85/19 mm envelope at 540 g, with a 570 mm cable and a AMP Superseal connector — the connector choice is the only electrical variant across the 80-pulse row. Each output pulse corresponds to 4.5° of rotation, and at the 5000 r/min limit the channel frequency is 6666.667 Hz — a figure to match against the receiver's input rating. at 45 mm bore the unit is sized for heavier shafts, and the correspondingly larger sensor ring raises the mass and the drive inertia reading the BMB stack left to right: the embedded bearing code fixes the ISO 15 boundary dimensions, /080S2 fixes the output as two 80-pulse signals, and the U + cage + connector tail describes region, cage material and plug. The 108A tail is the AMP Superseal connector option — a sealed automotive-grade plug chosen where the wiring harness needs a keyed, water-resistant interface, and its lead runs 5 mm longer than the free-end alternative. A U/B block specifies a glass-fibre reinforced PA66 ball cage — quieter than steel and better able to absorb the thermal cycling a rotor-mounted encoder sees. typical applications include elevator drive traction monitoring, steer-by-wire hand-wheel input and agricultural machinery rotor position sensing this unit is commonly specified for elevator drive traction monitoring and steer-by-wire hand-wheel input, where rotor position and speed sensing with a 80-pulse signal fits the controller's input in agricultural machinery rotor position sensing the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 540 g mass keeps the rotating inertia low the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses", "applications": [ "machine-tool spindle position monitoring", "elevator drive traction monitoring", "industrial automation axis control", "conveyor pulley speed and direction sensing" ], "failure_modes": [ "the connector variant (free cable end vs AMP Superseal) must be fixed at order time; the two are not field-interchangeable", "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail", "the interface is not a resolver or a standard encoder protocol — the controller must accept the specific N-pulse two-signal format this unit produces", "the sensor ring and the ball raceway share one compact unit — a bearing that is due for replacement takes the encoder signal with it, so renew both together" ], "pitfalls": [ "the cable tail is part of the unit and cannot be shortened freely — terminating it outside the specified connector changes the screening and can corrupt the signal", "the limiting speed is a mechanical limit for the embedded bearing; running above it shortens grease life long before the electronics fail", "the two output channels must be screened as a pair; running them alongside motor power cables induces noise that the controller can read as extra pulses" ], "faq": [ { "q": "What does the BMB designation mean?", "a": "In the BMB scheme a motor encoder unit that mounts directly on the rotor is encoded as BMB-6209/080S2/UB108A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the BMB-6209-080S2-UB108A?", "a": "Resolution is 80 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±5%, with the phase nominally 90° and held within ±30°." }, { "q": "Which bearing is inside the BMB-6209-080S2-UB108A?", "a": "The unit is built on a 6209 deep groove ball bearing of the 45/85/19 mm envelope, so the shaft and housing fits are the ordinary ISO 15 ones for that bearing size." }, { "q": "What connector does the BMB-6209-080S2-UB108A use?", "a": "Connection is by an AMP Superseal connector on a 570 mm lead, carrying two 80-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-6209-080S2-UB108A", "BMB-6209/080S2/UB108A" ], "locale_variants": {}, "d_mm": 45, "D_mm": 85, "B_mm": 19, "dynamic_load_kN": 33.2, "static_load_kN": 21.6, "fatigue_load_limit_kN": 0.915, "cage_type": "polymer_PA66", "pulses_per_rev": 80, "period_accuracy_pct": 5, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "cable_length_mm": 570, "connector_type": "amp_superseal", "limiting_speed_rpm": 5000, "max_rpm": 5000 }, { "sku": "AHE-5509A", "brand": "SKF", "manufacturer_designation": "AHE-5509A", "series": "AHE-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 66, "weight_estimated": false, "naming_rule_text": "The unit incorporates a sealed 6201 SKF Explorer deep groove ball bearing (12 mm bore, 32 mm OD, 10 mm width) lubricated for the life of the bearing, so the encoder ring turns with the outer ring rather than the shaft. Rated 32 pulses per revolution at ±4% period accuracy, the two output signals sit 90° apart within ±30°, with a duty cycle of 50 ± 10%; limiting speed 5000 r/min. Outer-ring rotation is the defining feature: the sensor target rotates while the inner ring stays fixed on the shaft, which suits integration into pulleys, cams, rollers or wheels as a compact encoder assembly. Mass is 66 g with a free cable end; at the 5000 r/min limiting speed the 32-pulse track reaches 2666.667 Hz per channel, i.e. 11.25° of rotation per pulse. the 32-pulse track is a coarse signal aimed at direction and speed detection; fine positioning must come from a separate sensing layer reading AHE-5509A: AHE is the SKF encoder unit family, the 55 block marks a roller encoder with outer-ring rotation, and the final letter is the variant/length code rather than a dimension. typical applications include machine-tool spindle position monitoring, industrial automation axis control and conveyor pulley speed and direction sensing this unit is commonly specified for machine-tool spindle position monitoring and industrial automation axis control, where outer-ring-rotation sensing with a 32-pulse signal fits the controller's input in conveyor pulley speed and direction sensing the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 66 g mass keeps the rotating inertia low the limiting speed of the embedded 6201 is quoted for the bearing alone; the surrounding pulley or wheel geometry can lower the usable speed the cable connector must be specified at order time, and a free cable end needs a properly screened termination to keep the two-channel signal clean the unit is meant to be integrated into pulleys, cams or wheels; an unsupported outer ring that is loaded through the sensor face damages the track", "applications": [ "elevator drive traction monitoring", "machine-tool spindle position monitoring", "steer-by-wire hand-wheel input", "agricultural machinery rotor position sensing" ], "failure_modes": [ "because the signal comes from the outer ring, any slip between the ring and the driven wheel shows up directly as position error", "the limiting speed of the embedded 6201 is quoted for the bearing alone; the surrounding pulley or wheel geometry can lower the usable speed", "the cable connector must be specified at order time, and a free cable end needs a properly screened termination to keep the two-channel signal clean", "the unit is meant to be integrated into pulleys, cams or wheels; an unsupported outer ring that is loaded through the sensor face damages the track", "the sealed 6201 is lubricated for life; adding a relubrication point is pointless and risks pushing the seal into the sensor track" ], "pitfalls": [ "the limiting speed of the embedded 6201 is quoted for the bearing alone; the surrounding pulley or wheel geometry can lower the usable speed", "the cable connector must be specified at order time, and a free cable end needs a properly screened termination to keep the two-channel signal clean", "the unit is meant to be integrated into pulleys, cams or wheels; an unsupported outer ring that is loaded through the sensor face damages the track" ], "faq": [ { "q": "What does the AHE designation mean?", "a": "In the AHE scheme a roller encoder unit with outer-ring rotation is encoded as AHE-5509A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the AHE-5509A?", "a": "Resolution is 32 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±4%, with the phase nominally 90° and held within ±30°." }, { "q": "Does the AHE-5509A rotate with the inner or the outer ring?", "a": "This roller encoder unit is an outer-ring rotation design: the 32-pulse sensor ring turns with the outer ring while the inner ring stays fixed on the shaft, which suits direct integration into a pulley, cam or wheel." }, { "q": "What cable and connector are fitted to the AHE-5509A?", "a": "Connection is by a free cable end, carrying two 32-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "AHE-5509A", "AHE-5509A" ], "locale_variants": {}, "pulses_per_rev": 32, "period_accuracy_pct": 4, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "duty_cycle_pct": 50, "duty_cycle_tolerance_pct": 10, "connector_type": "free_cable_end", "limiting_speed_rpm": 5000, "max_rpm": 5000 }, { "sku": "AHE-5401D", "brand": "SKF", "manufacturer_designation": "AHE-5401D", "series": "AHE-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 570, "weight_estimated": false, "naming_rule_text": "Internally a sealed SKF Explorer deep groove ball bearing carries the wheel-shaft load while a friction-torque device generates the steering feel; the assembly leaves the factory ready to mount, terminated in a AMP Superseal connector. Rated 64 pulses per revolution at ±8% period accuracy, the two output signals are 90° apart within ±30°, with a 50 ± 10% duty cycle; limiting speed 300 r/min. At 570 g the unit is designed to run untouched for its whole life: no field adjustment of phase or duty cycle, and no relubrication point to service. With 64 pulses per revolution each output pulse spans 5.625° of hand-wheel turn — 0.178 pulses to the degree — so the controller reads steering angle and rate straight off the wheel shaft. the 64-pulse signal gives enough angular detail for speed and direction sensing without demanding a high-frequency receiver interface the AHE-54/57 prefix identifies a steer-by-wire input device; unlike a motor encoder unit there is no embedded bearing code in the designation, because the internal bearing and friction device are fixed for the size. typical applications include textile spindle speed control, wind turbine yaw and pitch feedback and machine-tool spindle position monitoring this unit is commonly specified for textile spindle speed control and wind turbine yaw and pitch feedback, where hand-wheel input with a 64-pulse signal fits the controller's input in machine-tool spindle position monitoring the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 570 g mass keeps the rotating inertia low the AMP Superseal connector is keyed; forcing a mating plug damages the housing and can short the supply rail the internal bearing is not user-serviceable and the unit is relubrication-free; plan replacement as a complete assembly rather than a bearing swap the unit is supplied ready-to-mount; dismantling it to reach the bearing or the sensor destroys the factory calibration and the seal", "applications": [ "crane and hoist position limiting", "textile spindle speed control", "packaging machine index cams", "elevator drive traction monitoring" ], "failure_modes": [ "the unit expects hand-wheel speeds only; a motor-driven input will exceed its low limiting speed and destroy the friction device long before the electronics complain", "the AMP Superseal connector is keyed; forcing a mating plug damages the housing and can short the supply rail", "the internal bearing is not user-serviceable and the unit is relubrication-free; plan replacement as a complete assembly rather than a bearing swap", "the steering-feel device and the encoder share one sealed housing, so the assembly must never be opened to inspect the bearing — the housing is the calibration", "the unit is rated for a low limiting speed; it is a hand-wheel input device and must never be used as a high-speed shaft encoder" ], "pitfalls": [ "the AMP Superseal connector is keyed; forcing a mating plug damages the housing and can short the supply rail", "the internal bearing is not user-serviceable and the unit is relubrication-free; plan replacement as a complete assembly rather than a bearing swap", "the unit is supplied ready-to-mount; dismantling it to reach the bearing or the sensor destroys the factory calibration and the seal" ], "faq": [ { "q": "How is the AHE part number structured?", "a": "In the AHE scheme a steering encoder unit for steer-by-wire systems is encoded as AHE-5401D: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "How many pulses per revolution does the AHE-5401D deliver?", "a": "Resolution is 64 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±8%, with the phase nominally 90° and held within ±30°." }, { "q": "Is the AHE-5401D adjustable?", "a": "No. The steering encoder unit is supplied ready-to-mount and needs neither adjustment nor relubrication; the friction-torque device is factory-set to give the driver the specified steering feel." }, { "q": "What cable and connector are fitted to the AHE-5401D?", "a": "Connection is by an AMP Superseal connector, carrying two 64-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "AHE-5401D", "AHE-5401D" ], "locale_variants": {}, "pulses_per_rev": 64, "period_accuracy_pct": 8, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "duty_cycle_pct": 50, "duty_cycle_tolerance_pct": 10, "connector_type": "amp_superseal", "limiting_speed_rpm": 300, "max_rpm": 300 }, { "sku": "AHE-5701C", "brand": "SKF", "manufacturer_designation": "AHE-5701C", "series": "AHE-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 570, "weight_estimated": false, "naming_rule_text": "Internally a sealed SKF Explorer deep groove ball bearing carries the wheel-shaft load while a friction-torque device generates the steering feel; the assembly leaves the factory ready to mount, terminated in a AMP Superseal connector. Signal output is 256 pulses per revolution as two 90°-shifted channels, duty cycle 50 ± 10% and phase tolerance ±30°; the mechanical limit is 300 r/min. At 570 g the unit is designed to run untouched for its whole life: no field adjustment of phase or duty cycle, and no relubrication point to service. 256 pulses per revolution resolve 1.406° of hand-wheel rotation per pulse (0.711 pulses per degree), giving the steering controller its position and rate signal directly from the wheel shaft. this is the highest pulse count in the sensor bearing range at 256, chosen when the controller must resolve small angles between successive pulses reading the steering unit designation: AHE is the family, 54xx is the lower-pulse steering size and 57xx the higher-pulse size, and the final letter is the design generation — the connector is the same AMP Superseal part across the range. typical applications include electric drive commutation and speed control, automotive electric power steering and medical equipment rotary positioning this unit is commonly specified for electric drive commutation and speed control and automotive electric power steering, where hand-wheel input with a 256-pulse signal fits the controller's input in medical equipment rotary positioning the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 570 g mass keeps the rotating inertia low the unit is rated for a low limiting speed; it is a hand-wheel input device and must never be used as a high-speed shaft encoder the unit expects hand-wheel speeds only; a motor-driven input will exceed its low limiting speed and destroy the friction device long before the electronics complain there is no field adjustment for phase or duty cycle; a controller that expects a different signal convention needs a different unit, not a trim", "applications": [ "medical equipment rotary positioning", "electric drive commutation and speed control", "robotic joint position feedback", "crane and hoist position limiting" ], "failure_modes": [ "the unit is supplied ready-to-mount; dismantling it to reach the bearing or the sensor destroys the factory calibration and the seal", "the unit is rated for a low limiting speed; it is a hand-wheel input device and must never be used as a high-speed shaft encoder", "the unit expects hand-wheel speeds only; a motor-driven input will exceed its low limiting speed and destroy the friction device long before the electronics complain", "the friction-torque device is tuned for hand-wheel feel — altering or lubricating it changes the feedback the driver feels, not just the signal", "the steering-feel device and the encoder share one sealed housing, so the assembly must never be opened to inspect the bearing — the housing is the calibration" ], "pitfalls": [ "the unit is rated for a low limiting speed; it is a hand-wheel input device and must never be used as a high-speed shaft encoder", "the unit expects hand-wheel speeds only; a motor-driven input will exceed its low limiting speed and destroy the friction device long before the electronics complain", "there is no field adjustment for phase or duty cycle; a controller that expects a different signal convention needs a different unit, not a trim" ], "faq": [ { "q": "What does the AHE designation mean?", "a": "In the AHE scheme a steering encoder unit for steer-by-wire systems is encoded as AHE-5701C: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "How many pulses per revolution does the AHE-5701C deliver?", "a": "Resolution is 256 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±8%, with the phase nominally 90° and held within ±30°." }, { "q": "Is the AHE-5701C adjustable?", "a": "No. The steering encoder unit is supplied ready-to-mount and needs neither adjustment nor relubrication; the friction-torque device is factory-set to give the driver the specified steering feel." }, { "q": "How is the AHE-5701C connected?", "a": "Connection is by an AMP Superseal connector, carrying two 256-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "AHE-5701C", "AHE-5701C" ], "locale_variants": {}, "pulses_per_rev": 256, "period_accuracy_pct": 8, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 30, "duty_cycle_pct": 50, "duty_cycle_tolerance_pct": 10, "connector_type": "amp_superseal", "limiting_speed_rpm": 300, "max_rpm": 300 }, { "sku": "BMB-7052A", "brand": "SKF", "manufacturer_designation": "BMB-7052A", "series": "BMB-7052-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_g": 250, "weight_estimated": false, "naming_rule_text": "A 30/62/24.6 mm sensor bearing unit around a 6206 deep groove ball bearing (C 19.5 kN, C0 11.2 kN, Pu 0.475 kN) whose sensor ring reports rotor position once per revolution (N = 1). The angular error of the position signal is ±3.5°, the phase shift is 90° within ±3°; limiting speed 12000 r/min and mass 250 g. The unit is a load-carrying bearing first and a sensor second: the 62 mm outside diameter is a standard 6206 boundary, so housing and shaft tolerances are the ordinary ISO 15 ones, plus the associated snap ring for axial location. With a single position pulse per revolution the unit is aimed at rotor commutation and coarse position feedback, not at fine speed measurement. the 30 mm bore is the mid-range workhorse size, pairing a 62 mm outside diameter with enough load capacity for general rotor feedback BMB-7052A names a rotor positioning sensor bearing unit: BMB is the motor encoder family tag, 7052 is the unit code for the 6206-based position sensor, and the trailing A is the variant letter. typical applications include medical equipment rotary positioning, robotic joint position feedback and crane and hoist position limiting this unit is commonly specified for medical equipment rotary positioning and robotic joint position feedback, where rotor position and speed sensing with a 1-pulse signal fits the controller's input in crane and hoist position limiting the integrated bearing carries the shaft load while the sensor ring supplies the signal; the 250 g mass keeps the rotating inertia low the associated snap ring references a standard 6206 axial location; substituting a different ring alters the sensor air gap and the absolute angle reference the mounting must keep the sensing face concentric; eccentric mounting shows up as a once-per-revolution angle error of exactly the type the unit is meant to avoid the position pulse is referenced to the rotor, so any slip between the ring and the rotor is indistinguishable from a genuine angle change", "applications": [ "machine-tool spindle position monitoring", "medical equipment rotary positioning", "industrial automation axis control", "conveyor pulley speed and direction sensing" ], "failure_modes": [ "because the signal is once per revolution the controller cannot derive direction from it alone — a second sensing layer is needed if direction matters", "the associated snap ring references a standard 6206 axial location; substituting a different ring alters the sensor air gap and the absolute angle reference", "the mounting must keep the sensing face concentric; eccentric mounting shows up as a once-per-revolution angle error of exactly the type the unit is meant to avoid", "the position pulse is referenced to the rotor, so any slip between the ring and the rotor is indistinguishable from a genuine angle change", "the sensor ring shares the 6206 raceway load path, so the published C/C0 ratings apply to the combined unit, not to the ring alone" ], "pitfalls": [ "the associated snap ring references a standard 6206 axial location; substituting a different ring alters the sensor air gap and the absolute angle reference", "the mounting must keep the sensing face concentric; eccentric mounting shows up as a once-per-revolution angle error of exactly the type the unit is meant to avoid", "the position pulse is referenced to the rotor, so any slip between the ring and the rotor is indistinguishable from a genuine angle change" ], "faq": [ { "q": "What does the BMB prefix stand for?", "a": "In the BMB scheme a rotor positioning sensor bearing unit is encoded as BMB-7052A: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What angular resolution does the BMB-7052A give?", "a": "Resolution is 1 pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±undefined%, with the phase nominally 90° and held within ±3°." }, { "q": "How accurate is the BMB-7052A position signal?", "a": "The rotor positioning sensor bearing unit reports one position pulse per revolution with a maximum angle error of ±3.5°, referenced to the rotor; it is a position reference, not a fine speed sensor." }, { "q": "What cable and connector are fitted to the BMB-7052A?", "a": "Connection is by a free cable end, carrying two 1-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMB-7052A", "BMB-7052A" ], "locale_variants": {}, "d_mm": 30, "D_mm": 62, "B_mm": 24.6, "dynamic_load_kN": 19.5, "static_load_kN": 11.2, "fatigue_load_limit_kN": 0.475, "pulses_per_rev": 1, "phase_shift_deg": 90, "phase_shift_tolerance_deg": 3, "angle_error_deg": 3.5, "connector_type": "free_cable_end", "associated_snap_ring": "SP 62", "limiting_speed_rpm": 12000, "max_rpm": 12000 }, { "sku": "BMD-0123-ZJ6", "brand": "SKF", "manufacturer_designation": "BMD-0123/ZJ6", "series": "BMD-0123-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_estimated": false, "naming_rule_text": "Built on a 6202 envelope measuring 15/35/11 mm, the unit adds a sensor ring that tracks 6 rotor pole pairs. The unit is rated to 22000 r/min over −40 to +150 °C, and because the sensor ring turns with the rotor the electrical frequency tracks the 6 pole pairs directly. Because the envelope is the ordinary 6202 15/35/11 mm one, it substitutes directly into a standard bearing seat while adding the position signal. Every shaft revolution produces 6 electrical cycles from the sensor ring — the 6-pole-pair count is what sets the controller's commutation frequency. the 15 mm bore places this in the small end of the range, where the compact rotor-mounted envelope suits light shafts and tight bearing seats BMD-0123/ZJ6 names a rotor positioning bearing: BMD is the family tag, 0123 is the unit code, and the ZJ suffix carries the rotor pole-pair count — ZJ6 resolves 6 pole pairs. typical applications include electric drive commutation and speed control, automotive electric power steering and medical equipment rotary positioning this unit is commonly specified for electric drive commutation and speed control and automotive electric power steering, where rotor position and speed sensing with a undefined-pulse signal fits the controller's input in medical equipment rotary positioning the integrated bearing carries the shaft load while the sensor ring supplies the signal; the undefined g mass keeps the rotating inertia low the ZJ pole-pair code is tied to the rotor magnet count — a rewind or a magnet change invalidates the pairing and the commutation frequency with it the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing", "applications": [ "elevator drive traction monitoring", "electric drive commutation and speed control", "steer-by-wire hand-wheel input", "agricultural machinery rotor position sensing" ], "failure_modes": [ "the pole-pair count (ZJ6/ZJ8) must match the rotor; a mismatch makes the commutation frequency wrong from the first revolution", "the ZJ pole-pair code is tied to the rotor magnet count — a rewind or a magnet change invalidates the pairing and the commutation frequency with it", "the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it", "mounting the bearing with the sensor ring facing the wrong way leaves the rotor without position feedback even though the shaft turns freely", "the sensing face must stay concentric with the rotor; the ordinary 6202 fit tolerances alone do not guarantee the air gap without correct axial location" ], "pitfalls": [ "the ZJ pole-pair code is tied to the rotor magnet count — a rewind or a magnet change invalidates the pairing and the commutation frequency with it", "the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it", "electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing" ], "faq": [ { "q": "How is the BMD part number structured?", "a": "In the BMD scheme a rotor positioning bearing with an integrated sensor ring is encoded as BMD-0123/ZJ6: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the BMD-0123-ZJ6?", "a": "Resolution is undefined pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±undefined%." }, { "q": "How many pole pairs does the BMD-0123-ZJ6 resolve?", "a": "The sensor ring resolves 6 rotor pole pairs, so it completes 6 electrical cycles per shaft revolution. Match the ZJ suffix to the rotor's actual pole-pair count." }, { "q": "How is the BMD-0123-ZJ6 connected?", "a": "Connection is by a free cable end, carrying two undefined-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMD-0123-ZJ6", "BMD-0123/ZJ6" ], "locale_variants": {}, "d_mm": 15, "D_mm": 35, "B_mm": 11, "temp_min_c": -40, "temp_max_c": 150, "pole_pairs": 6, "limiting_speed_rpm": 22000, "max_rpm": 22000 }, { "sku": "BMD-0123-ZJ8", "brand": "SKF", "manufacturer_designation": "BMD-0123/ZJ8", "series": "BMD-0123-series", "type": "encoder_unit", "material": "GCr15", "standard": "ISO 15", "weight_estimated": false, "naming_rule_text": "Built on a 6202 envelope measuring 15/35/11 mm, the unit adds a sensor ring that tracks 8 rotor pole pairs. Rated for 22000 r/min and an operating temperature of −40 to +150 °C, the sensor ring turns with the rotor so the electrical frequency follows the pole-pair count directly. The bearing is a 6202 envelope unit, so it drops into standard 15/35/11 mm housing and shaft fits; the sensor function is added without changing the boundary dimensions. Every shaft revolution produces 8 electrical cycles from the sensor ring — the 8-pole-pair count is what sets the controller's commutation frequency. at 15 mm bore the unit is one of the smaller sizes listed, favoured for compact rotors and applications where housing space is limited reading BMD-0123/ZJ8: the /ZJ block is not a tolerance or clearance code but the number of rotor pole pairs the sensor ring resolves (8 here); it is the only variant selector between the /ZJ6 and /ZJ8 units. typical applications include medical equipment rotary positioning, robotic joint position feedback and crane and hoist position limiting this unit is commonly specified for medical equipment rotary positioning and robotic joint position feedback, where rotor position and speed sensing with a undefined-pulse signal fits the controller's input in crane and hoist position limiting the integrated bearing carries the shaft load while the sensor ring supplies the signal; the undefined g mass keeps the rotating inertia low the ring adds mass and a sensing face to a standard 6202 envelope, so treat the handling and mounting as that of a precision assembly, not a plain bearing electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it", "applications": [ "machine-tool spindle position monitoring", "medical equipment rotary positioning", "industrial automation axis control", "conveyor pulley speed and direction sensing" ], "failure_modes": [ "the sensing face must stay concentric with the rotor; the ordinary 6202 fit tolerances alone do not guarantee the air gap without correct axial location", "the ring adds mass and a sensing face to a standard 6202 envelope, so treat the handling and mounting as that of a precision assembly, not a plain bearing", "electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing", "the ZJ pole-pair code is tied to the rotor magnet count — a rewind or a magnet change invalidates the pairing and the commutation frequency with it", "the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it" ], "pitfalls": [ "the ring adds mass and a sensing face to a standard 6202 envelope, so treat the handling and mounting as that of a precision assembly, not a plain bearing", "electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing", "the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it" ], "faq": [ { "q": "What does the BMD prefix stand for?", "a": "In the BMD scheme a rotor positioning bearing with an integrated sensor ring is encoded as BMD-0123/ZJ8: the suffix block carries the pulses-per-revolution count, the S2 two-signal flag, the region and cage letters, and the connector code, so the full spec is readable from the part number." }, { "q": "What is the resolution of the BMD-0123-ZJ8?", "a": "Resolution is undefined pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±undefined%." }, { "q": "How many pole pairs does the BMD-0123-ZJ8 resolve?", "a": "The sensor ring resolves 8 rotor pole pairs, so it completes 8 electrical cycles per shaft revolution. Match the ZJ suffix to the rotor's actual pole-pair count." }, { "q": "What cable and connector are fitted to the BMD-0123-ZJ8?", "a": "Connection is by a free cable end, carrying two undefined-pulse channels. The cable and connector variant is an order-time choice and cannot be changed in the field." } ], "cross_ref": [], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units", "extracted_at": "2026-10-19", "last_verified": "2026-10-19", "confidence_score": 0.7, "status": "published", "aliases": [ "BMD-0123-ZJ8", "BMD-0123/ZJ8" ], "locale_variants": {}, "d_mm": 15, "D_mm": 35, "B_mm": 11, "temp_min_c": -40, "temp_max_c": 150, "pole_pairs": 8, "limiting_speed_rpm": 22000, "max_rpm": 22000 } ]