BMB-6209-080S2-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-6209-080S2-UB008A model number is decoded

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

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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