BMB-6208-080S2-UB008A sensor bearing unit: specifications & signal data

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units) · extracted 2026-10-19

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.

How the BMB-6208-080S2-UB008A model number is decoded

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

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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