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Flexible Disc Coupling

Flexible Disc Coupling

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slip or disconnect when some torque limit is exceeded.


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flexible disc coupling

The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. By careful selection, installation and maintenance of couplings, substantial savings can be made in reduced maintenance costs and downtime.

Shaft couplings are used in machinery for several purposes. The most common of which are the following.

To provide for the connection of shafts of units that are manufactured separately such as a motor and generator and to provide for disconnection for repairs or alterations.

To provide for misalignment of the shafts or to introduce mechanical flexibility.

To reduce the transmission of shock loads from one shaft to another.

To introduce protection against overloads.

To alter the vibration characteristics of rotating units.

To connect driving and the driven part

To transfer power one end to another end.(ex: motor transfer power to pump through coupling)

Disc couplings transmit torque from a driving to a driven bolt tangentially on a common bolt circle. Torque is transmitted between the bolts through a series of thin, stainless steel discs assembled in a pack. Misalignment is accomplished by deforming of the material between the bolts.

flexible disc coupling


Reference Number System

Reference Number System

Standard Shaft Bore Diameter List

Size Standard Shaft Bore Dia. (mm)
NES50 5 6 6.35 7 8 9 9.525 10
NES70 8 9 9.525 10 11 12 14
NES100 8 9 9.525 10 11 12 14 15
NES250 10 11 12 14 15 16 17 18 19 20
NES800 14 15 16 17 18 19 20 22 24
NES1300 19 20 22 24 25 28 30 32
NES2000 25 28 30 32 35
NES3000 32 35 38 40 42

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