How To Choose An NM Coupling For An Air Compressor

Air compressor coupling selection starts with the drive data, not with coupling diameter. Confirm motor power and speed or transmitted torque, both shaft diameters, start/stop frequency, duty cycle and the environment around the drive.

Start With Torque And Speed

Use the motor power and operating speed to establish the steady torque, then account for the real start-up and transient behavior of the compressor. The selected coupling should be reviewed against the applicable normal and transient load basis rather than assuming that a “maximum” table value is a continuous rating.

Check Both Shaft Sizes

Compare the driver and driven shaft diameters with the candidate model bore range. A larger coupling may be necessary because of shaft size even when the torque is modest. Provide keyway details and any shoulder or hub-length limits.

Review The Environment

State temperature, oil exposure, contamination, ventilation and maintenance access. The exact flexible-element compound should be confirmed for the service environment rather than guessed from appearance.

Alignment And Installation

Align the shafts before installing the flexible element. Verify hub spacing and fastening, then inspect for abnormal noise, heat or repeated wear after commissioning.

Model Comparison

Illustration av NM 50-serien med flexibel käftkoppling

NM 50 Flexibel käftkoppling

Borrning 7–19 mmMax 12500 varv/minNormalvikt 1,3 kg*m

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Illustration av NM 67-serien med flexibel käftkoppling

NM 67 Flexibel käftkoppling

Borrning 8–28 mmMax 10000 varv/minNormalvikt 2,2 kg*m

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Illustration av NM 82-serien med flexibel käftkoppling

NM 82 Flexibel käftkoppling

Borrning 10–32 mmMax 8000 varv/minNormalvikt 5,0 kg*m

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Illustration av NM 97-serien med flexibel käftkoppling

NM 97 Flexibel käftkoppling

Borrning 10–42 mmMax 7000 varv/minNormalvikt 10,5 kg*m²

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Illustration av NM 112-serien med flexibel käftkoppling

NM 112 Flexibel käftkoppling

Borrning 14–48 mmMax 6000 varv/minNormalvikt 16,7 kg*m

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Illustration av NM 128-serien med flexibel käftkoppling

NM 128 Flexibel käftkoppling

Borrning 18–55 mmMax 5000 varv/minNormalvikt 26,7 kg*m²

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Key Takeaways

Torque, speed and both bores must all fit.
Starting duty matters for compressor applications.
Element specification depends on environment.
Final bore/keyway work should follow the approved drawing.

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