Elastic couplings reduce intermittent short period torsional shocks, by briefly storing the shock energy. Any degree of uneven movement and load transfer is consequently reduced. Elastic couplings restrain body resonance, and therefore contribute to noise reduction. The elastic SPIDEX^®- coupling transmits the torque safely preventing break-down.

The convex generated profiled tooth crown, (see fig. 1), allows compensation of radial and angular displacements of the two connected shafts. It consists of a thermoplastic Polyurethane elastomer, which is exclusively pressure loaded and designed for high abrasion resistance and elasticity, to have good damping characteristics, and to be resistant to oils, greases, many solvents, atmospheric effects and ozone, as well as good resistance to hydrolysis in tropical conditions. The operating temperatures are between -40 °C and +100 °C. Short temperature peaks up to +120°C are admissible. The standard hardness of the spider is 92° Shore A. For low torques a spider of 80° Shore A can be used, and for higher torques a spider of 95° to 98° Shore A can be used.