Half couplings are generally made of forgings. During rough machining, some margin is left on each side, 

and residual stress heat treatment is required before the boring process can be carried out. The boring of 

the pin coupling is usually carried out on a lathe, because the requirements for machining the coupling 

sleeve hole are very high, so the finishing of the hole is usually done by grinding, and the finishing of the 

outer surface of the pin coupling is in progress. Boring is carried out in the same clamping.

The size of the processed hole and the contact between the hole and the shaft mating surface need to be 

inspected. Generally, a tapered column can be used to ensure the interchangeability of parts. Due to the 

small mass and elasticity of the middle square slider, it is allowed to withstand higher rotational speeds. 

The middle slider can also be made of nylon, and a small amount of graphite or molybdenum disulfide is 

added during preparation to make it self-lubricating.

Pin couplings transmit torque in the same way. The diaphragm itself is very thin, so it bends easily when 

relative displacement loads occur. Therefore, it can withstand deviations of up to 1.5 degrees, while 

producing lower vibration in the servo system. Bearing load. Diaphragm couplings are often used in servo 

systems. The diaphragm has good torque rigidity and is easily damaged if misused or not installed correctly 

during use.

The shaft system of the coupling is asymmetrical, which increases the additional torque, which causes the 

coupling to heat up and break when in use. Because the scope of use of couplings is relatively wide, they are 

widely used in many industries. The pin coupling may be used improperly in the specific situation, or it may be 

used without careful consideration, which may also cause the coupling to be damaged.