BMD-0123-ZJ6 sensor bearing unit: specifications & signal data
The BMD-0123-ZJ6 is a sensor bearing unit sized 15 x 35 x 11 mm with a 22000 rpm limiting speed per ISO 15. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 15 mm |
| Outer diameter D | 35 mm |
| Width B | 11 mm |
| Material | GCr15 |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +150 °C |
| Manufacturer designation | BMD-0123/ZJ6 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units |
| Last verified | 2026-10-19 |
| Pole pairs resolved | 6 |
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.
Dimensions in inches & BMD-0123-series range
| Bore d | 0.591 in |
|---|---|
| Outer diameter D | 1.378 in |
| Width B | 0.433 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 10 mm |
| Smallest bore in BMD-0123-series | 15 mm |
| Largest outer diameter in BMD-0123-series | 35 mm |
| Width range across BMD-0123-series | 11–11 mm |
| Bore position in BMD-0123-series (smallest first) | 1 of 1 |
| Bore above smallest BMD-0123-series size | 0 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the BMD-0123-ZJ6 model number is decoded
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
Typical equipment & failure modes
Common applications
- elevator drive traction monitoring
- electric drive commutation and speed control
- steer-by-wire hand-wheel input
- agricultural machinery rotor position sensing
Known failure patterns
- 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
Selection pitfalls — read before you substitute
- 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
Frequently asked questions
How is the BMD part number structured?
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.
What is the resolution of the BMD-0123-ZJ6?
Resolution is undefined pulses per revolution, delivered as two phase-shifted channels; the period accuracy is ±undefined%.
How many pole pairs does the BMD-0123-ZJ6 resolve?
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.
How is the BMD-0123-ZJ6 connected?
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.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 17 sensor bearing units on 2026-10-19. Read our editorial & correction policy.