The center disc comes in acetal for high torsional stiffness or nylon for shock absorption and vibration dampening. The low-cost couplings feature electrical isolation and mechanical fuse properties. Available in seven sizes of setscrew or clamp-style hubs with bores from 1/8 to 1 in. (3 to 25 mm). The hubs are anodized for improved lubricity and increased life.

Ruland Mfg. Co. Inc., 6 Hayes Memorial Dr., Marlborough, MA 01752, (508) 485-1000,