A FF shaft coupling bearing (ลูกปืนจับยึดปลายเพลา FF, which is the term in Thai) is used to transmit power from the driving shaft to the driven shaft of a motor, etc. By introducing mechanical flexibility, shaft couplings allow for shaft misalignment. As a result, this adaptability in the coupling can lessen misalignment-related bearing wear, vibration in the machinery, and other mechanical issues.

A tiny type of shaft coupling is used mostly in FA (factory automation), and a huge casting type is used in wind and hydraulic power machines for transmitting massive amounts of power.

The former is known as a coupling in NBK, whereas the latter is known as a shaft coupling. The topic of this discussion is the shaft coupling.

Variety Of Shaft Couplings

Various shaft couplings are available for use in multiple contexts. Let’s get some more info about them:

· Beam Couplings

One variety of shaft couplings is this one. Single or multiple helical incisions in the coupling body comprise the beam coupling, which can accommodate parallel misalignments of up to 0.025 inches and angular misalignments of up to 7 degrees. Torques under 100 lb-ft typically find utility in motion control applications. Zero-backlash versions are provided to guarantee accurate placement of the driving and guiding shafts.

· Bellows Couplings

Bellows couplings are also suitable for use in motion control systems. The great torsional rigidity provided by their construction of numerous metal convolutions is essential in positioning applications. Although their torque transmitting capacities are equivalent to beam couplings, their torsional rigidity limits their tolerance for angular and parallel misalignment.

· Chain Couplings

Chain couplings can transfer hundreds of horsepower and are purpose-built for power transmission. There is typically a 2-degree angular misalignment allowance and a 0.015-inch parallel misalignment allowance. Chain couplings are flexible because of the clearances between the chain sprockets and the twin big roller chains.

· Jaw Couplings

Jaw couplings are another variation of shaft couplings in addition to the varieties above. Straight and curved jaw couplings are used for light power transfer and motion modulation. They consist of pairs of multi-jawed hubs that mate with elastomeric spiders. A torque gearbox with no backlash is made feasible by the specification. Misalignment in the parallel plane can often be accommodated to within 0.01 inches, and misalignment in the angular plane to within 1 degree. Elastomeric spiders add damping power to these couplings and are usually offered in various durometers to tailor their performance to specific applications. These couplings can transmit torques of up to one thousand inch pounds without the need for any lubrication.


This essay was written to illuminate certain aspects of this subject and encourage further study. To learn more about them, or if you need clarification on the sort of shaft coupling you require and the best solution, it is important to speak with an expert.