Spider coupling is also called jaw coupling. It is mechanical part mainly used for connecting two rotating shafts in mechanical transmit of torque or rotation angle. The spider coupling is also used for protecting safety devices. The Jaw coupling can not be dismantled when the device is running. Spider coulings contains two parts: hubs and spider. The material for spider is polyurethane. It has different hardness. 98 shore and 92 shore are often required. Clamp type and set screw type mounting ways are available for the flexible coupling.

Flexible coupling is used between encoder and motor. Sometimes, it is called encoder coupling or motor coupling. Encoder coupling is a mechanical part used to couple two shafts (driving shaft and driven shaft) in different mechanisms to rotate together in order to transmit torque are used to transmit torque from one shaft to another when the two shafts are slightly misaligned. Motor coupling can adapt to different degrees of misalignment up to 3°. The high speed encoder coupling and low speed large torque motor coupling are widely applied to universal mechanical devices, like paper making machinery, ventilating device.

The clamp diaphragm couplings are divided to single diaphragm coupling and double diaphragm coupling. Disc coupling has the features of anti-oil and anti-corrosion. Keyway is optional on request. Disc coupling is used in machine tools, stepping servo system and screw spindle drive. ROUNDSS Flexible couplings provide multiple types: Spider, Diaphragm, Expansion Bushing, Wall-Bellows, Helical, Metal plate spring, Parallel, Fiber glass, and Odham. Most of them have clamp style and screw style, some are also divided into single and double.