The zero backlash jaw coupling is comprised of an elastic "spider" and two hubs. The spider, made of an advanced polyurethane material, provides dampening of impulse loads, minimizing shock to the motor and other sensitive equipment. Available in three durometers, these spiders allow the user to customize the jaw coupling's performance. Selecting a soft spider will give the jaw coupling the greatest dampening characteristics, while a hard spider will provide the greatest torsional stiffness and strength.

All jaw coupling spiders are press fit onto a curved jaw profile, assuring zero backlash operation. The curved jaw profile concentrates the forces to the center of the spider's limbs, improving the effectiveness of the elastomer material. Raised contact points on the spider limbs help maintain proper spacing between the two hubs, assuring electrical isolation and full angular misalignment capabilities. The jaw coupling is considered fail safe because, if the spider fails, the jaws of the two hubs interlock allowing direct power transmission, allowing the application to be safely shut down for maintenance.

Learn more about how to choose a servo coupling for your particular application from a Ruland expert. Read "What to Look for in a Servo Coupling" or "Tips to Simplify Servo Coupling Selection" written by William Hewitson, director of manufacturing.

Keyways are available in jaw couplings as well. Shown here alongside an oldham coupling with keyways.

To see the latest "Ruland in the News" article on jaw couplings click here.

Bellows Couplings:

Aluminum Hubs: 2024 T351 or 7075 T651 bar

Bellows: AISI 321 stainless steel