BMB-6208-080S2-UB108A 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-UB108A model number is decoded

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

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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