An NM coupling is a flexible shaft coupling built around two hubs and a separate resilient element. The hubs connect the driver and driven shafts; the element sits between their driving features and provides the compliant interface. That simple description matters because it tells you what must be matched during replacement: coupling size, both bores, the flexible element and the operating duty.
Why buyers use the NM layout
The layout is compact, easy to understand and practical for general industrial drives. The flexible element can isolate the metal hubs from direct drive contact during normal operation and gives the connection a degree of compliance. It does not remove the need for alignment, nor does it make every NM size suitable for every motor.
Model range
| Model | Bore Range | Reference Max Speed | Reference Normal Torque | |
|---|---|---|---|---|
| NM50 | 7-19 mm | 12500 rpm | 1.3 kgfu00b7m | View model |
| NM67 | 8-28 mm | 10000 rpm | 2.2 kgfu00b7m | View model |
| NM82 | 10-32 mm | 8000 rpm | 5.0 kgfu00b7m | View model |
| NM97 | 10-42 mm | 7000 rpm | 10.5 kgfu00b7m | View model |
| NM112 | 14-48 mm | 6000 rpm | 16.7 kgfu00b7m | View model |
| NM128 | 18-55 mm | 5000 rpm | 26.7 kgfu00b7m | View model |
| NM148 | 22-65 mm | 4500 rpm | 41.7 kgfu00b7m | View model |
| NM168 | 28-75 mm | 4000 rpm | 59.5 kgfu00b7m | View model |
| NM194 | 32-85 mm | 3500 rpm | 112.0 kgfu00b7m | View model |
| NM214 | 40-95 mm | 3000 rpm | 167.0 kgfu00b7m | View model |
Use the table to narrow the NM size. Finished bores, keyways and application duty are confirmed for the ordered configuration.
What to send for a replacement
| Item | What to confirm |
|---|---|
| Visible marking | NM size or any legible hub/element marking. |
| Both shafts | Actual diameter and keyway information. |
| Speed | Operating rpm. |
| Machine | What the motor is driving. |
| Quantity | Number of complete couplings and/or replacement elements. |
Request an NM Coupling Quote
Send the shaft sizes, speed, duty and quantity. We will review the model and machining details before quotation.
