BMD-0123-ZJ8 sensor bearing unit: specifications & signal data
The BMD-0123-ZJ8 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/ZJ8 |
| 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 | 8 |
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-ZJ8 model number is decoded
Built on a 6202 envelope measuring 15/35/11 mm, the unit adds a sensor ring that tracks 8 rotor pole pairs. Rated for 22000 r/min and an operating temperature of −40 to +150 °C, the sensor ring turns with the rotor so the electrical frequency follows the pole-pair count directly. The bearing is a 6202 envelope unit, so it drops into standard 15/35/11 mm housing and shaft fits; the sensor function is added without changing the boundary dimensions. Every shaft revolution produces 8 electrical cycles from the sensor ring — the 8-pole-pair count is what sets the controller's commutation frequency. at 15 mm bore the unit is one of the smaller sizes listed, favoured for compact rotors and applications where housing space is limited reading BMD-0123/ZJ8: the /ZJ block is not a tolerance or clearance code but the number of rotor pole pairs the sensor ring resolves (8 here); it is the only variant selector between the /ZJ6 and /ZJ8 units. 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 undefined-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 undefined g mass keeps the rotating inertia low the ring adds mass and a sensing face to a standard 6202 envelope, so treat the handling and mounting as that of a precision assembly, not a plain bearing electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it
Typical equipment & failure modes
Common applications
- machine-tool spindle position monitoring
- medical equipment rotary positioning
- industrial automation axis control
- conveyor pulley speed and direction sensing
Known failure patterns
- 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
- the ring adds mass and a sensing face to a standard 6202 envelope, so treat the handling and mounting as that of a precision assembly, not a plain bearing
- electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing
- 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
Selection pitfalls — read before you substitute
- the ring adds mass and a sensing face to a standard 6202 envelope, so treat the handling and mounting as that of a precision assembly, not a plain bearing
- electrical noise on the signal is usually an earthing and routing problem; re-routing the cable solves it more often than changing the bearing
- the sensor ring is integrated and not replaceable; a bearing that reaches the end of its life takes the sensor with it
Frequently asked questions
What does the BMD prefix stand for?
In the BMD scheme a rotor positioning bearing with an integrated sensor ring is encoded as BMD-0123/ZJ8: 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-ZJ8?
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-ZJ8 resolve?
The sensor ring resolves 8 rotor pole pairs, so it completes 8 electrical cycles per shaft revolution. Match the ZJ suffix to the rotor's actual pole-pair count.
What cable and connector are fitted to the BMD-0123-ZJ8?
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.