BMB-6209-080S2-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-6209-080S2-UB108A model number is decoded

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

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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