Start with the drive duty, not the outside diameter. The coupling has to accept the torque and speed while also fitting both shafts. A model that fits the bore but is wrong for the duty is not a sound selection; neither is a model with enough torque capacity but no room for the required finished bore.
A practical sequence
NM model reference
| 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.
Do not select from one number alone
Motor power is useful when torque is not supplied, but it is not the whole duty. Starts, shock, reversals and the driven machine can change the selection. Likewise, the bore range is a model-matching reference; the finished bore still has to be specified for each hub.
Request an NM Coupling Quote
Send the shaft sizes, speed, duty and quantity. We will review the model and machining details before quotation.
