Colección:Jaw Coupling Elements

Jaw coupling elements, also called spiders, are the elastic part of a jaw coupling. The spider sits between the jaws of the two coupling hubs, transmits the torque from motor to driven machine, for example a hydraulic pump, damps vibrations and compensates small misalignments between the shafts.

Because the spider takes all the load and the flexing, it is the wear part of the coupling. Replacing a worn spider in time protects the shafts and bearings, and it is much cheaper than replacing the hubs. Spiders are made of polyurethane elastomer in several hardness grades, given in Shore A or Shore D and usually marked by colour. The hardness determines how stiff the coupling is and how much it damps.

The spider must match the coupling series and size of the hubs, as jaw profiles differ between makes. When replacing a worn spider, order the same hardness as the original unless the drive has been recalculated. Manufacturers sometimes change the colour code over time, so check the hardness value rather than the colour alone.