NM-50 Flexible Jaw Coupling Nitrile Element, 12.74 Nm Nominal Torque

Nitrile (NBR) elements for NM series flexible jaw couplings, in sizes NM-50 to NM-128. NM series flexible jaw couplings have a distinctive element that weaves in and out between the jaws. The ring has high internal damping, so when the drive reaches a dangerous speed range the coupling limits the torsional oscillation and protects the linked machines. Elements are nitrile rubber (NBR, grade Pb72) in 72 and 82 Shore A hardness, with a temperature range of -40 °C to +120 °C.

The element weaves in and out between the jaws and is the part that takes up shock and wears. The hubs are sold separately.

Where this product is used

• Motor to pump, fan and compressor drives
• Gearbox and conveyor drives
• Drives that pass through a critical speed range
• General machinery drives with shock loading

Features

• Nitrile rubber (NBR, Pb72) element for NM series couplings
• Hardness of 72 and 82 Shore A, temperature range -40 °C to +120 °C
• Weaving ring with high internal damping
• Nominal torque, maximum torque and maximum speed listed for every size
• Sizes NM-50 to NM-128

Key specifications

Sizes available

Selecting and fitting

Choose the size from the torque and the shaft sizes, and apply a service factor for the type of machine. The nominal torque is the continuous rating and the maximum torque is the peak rating listed for the size. The power rating is listed in kW per rpm, so multiply it by the speed in rpm for the power at your speed.

The matching hub is Flexible Jaw Coupling Hub, Pilot Bore.

Isolate the drive before working on the coupling. Align the two shafts as closely as you can before fitting the coupling, and check the alignment again once the coupling is fitted. Good alignment gives the longest life, whatever the coupling type.

Dimensions are as listed in the manufacturer catalogue and are for reference. Contact AIMS to confirm a measurement if it is critical to your application.