Product appearance varies with coupling size and finished bore. Use the model table below for dimensions and send both shaft details for machining.
NM112 Flexible Coupling
NM112 provides 70 N.m nominal torque, up to 48 mm bore capacity and a rated speed limit of 3000 rpm. It is suited to mid-range pumps, blowers, mixers and machinery when torque, shaft fit, alignment and installation space are all within the model limits.
NM112 technical data
NM112 opens the mid-range group with 70 N.m nominal torque and a 48 mm maximum bore. It is often evaluated when a drive has a noticeably larger shaft interface but still operates within a 3000 rpm limit.
| Model | Nominal torque | Speed limit | D | D1 | d max | L | S | Radial | Angular |
|---|---|---|---|---|---|---|---|---|---|
| NM112 | 70 N.m | 3000 rpm | 112 mm | 79 mm | 48 mm | 60 mm | 3.5 +/- 1.0 mm | 0.07 mm | 2.5 deg |
D, D1, d max, L, S and radial values are in millimetres. Angular displacement is shown in degrees. On smaller screens, drag the table horizontally to view all columns.
Fit and machining checks
At 112 mm outside diameter and 60 mm length, installation space becomes more visible in the selection. Check guard diameter, shaft projection and access for the flexible element before fixing the bore dimensions on the drawing.
Where this size fits
Pumps, mixers, conveyors and general machinery can bring different starting behavior to the same nominal power. For NM112, state whether the drive starts loaded, cycles frequently or sees process shock so the application can be reviewed beyond its 70 N.m continuous rating.
Alignment and assembly
NM112 uses S 3.5 +/- 1.0 mm, with 0.07 mm radial and 2.5 degree angular limits. Measure alignment after final machine tightening because base distortion or connected piping can move the shafts from an earlier workshop setting.
Prepare the NM112 RFQ
Send both shaft diameters, keyways, speed and duty, plus quantity and destination. If either bore approaches 48 mm, include the keyway and fit requirement so the machining request can be checked with the available hub section.
Material and service conditions
The standard flexible element is NBR. For elevated temperature, chemical exposure or a nonstandard hardness request, give the service conditions with the NM112 enquiry so the quoted element can be specified clearly.
Compare the nearest NM sizes
If NM112 is too small on bore or torque, compare NM128. If its 112 mm diameter creates a packaging problem and the load permits, NM97 is the nearest smaller alternative to review.
