How to Select an NM Coupling – EVER POWER NM Couplings

EVER POWER · NM Coupling Technical Guide

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

1. Define the duty

Identify the driver, driven equipment, operating speed and torque or motor data.

2. Check both shafts

Confirm driver and driven shaft diameters, keyways and available space.

3. Narrow the NM size

Use the reference range to identify candidate models.

4. Confirm the order configuration

Finalize bores, keyways, quantity and any special process on the order drawing.

NM model reference

Model	Bore Range	Reference Max Speed	Reference Normal Torque
NM50	7–19 mm	12500 o/min	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.

Be om et tilbud på NM-kobling

Send the shaft sizes, speed, duty and quantity. We will review the model and machining details before quotation.

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