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The NM flexible shaft coupling is a type of coupling used to connect two shafts that are not perfectly aligned. It is a popular choice for applications where there is misalignment between the shafts, such as in pumps, gearboxes, and compressors.

The NM flexible shaft coupling consists of two cast iron hubs, a rubber element, and a keyway. The rubber element is bonded to the hubs and provides flexibility between the shafts. The keyway is used to prevent the shafts from rotating relative to each other.

Here are some of the benefits of using an NM flexible shaft coupling:

• Accommodates misalignment: NM couplings can accommodate both angular and parallel misalignment between the shafts.
• High shock and vibration resistance: The rubber element in the coupling absorbs shock and vibration, protecting the connected equipment.
• Low maintenance: NM couplings require minimal maintenance, making them a cost-effective solution.
• Wide range of sizes: NM couplings are available in a wide range of sizes to accommodate a variety of applications.

Here are some things to consider when selecting an NM flexible shaft coupling:

• Shaft size: The coupling must be sized to fit the diameter of the shafts that will be connected.
• Maximum speed and torque: The coupling must be rated for the maximum speed and torque that will be applied to it.
• Misalignment: The coupling must be able to accommodate the amount of misalignment that is present between the shafts.
• Environment: The coupling material must be compatible with the environment in which it will be used.

NM flexible shaft couplings are a versatile and reliable solution for a variety of applications. They are a good choice for applications where there is misalignment between the shafts, high shock and vibration loads, and a need for low maintenance.