zero-max manufactures a wide range of couplings and known throughout the world for the cd coupling, a zero-backlash coupling combining the best features found in both steel disk and elastomeric couplings. through its patented open arm design and use of rugged composite materials, the cd coupling offers high misalignment and high torsional stiffness and zero-backlash. cd couplings are available in diameters from 1.85 - 12, aluminum and stainless steel construction, clamp style hubs or set screw hubs, plus custom designs are available. additional zero-max products include: servo class couplings, flexible couplings torque-limiting clutches, torq-tenders, mechanical torque limiters, single-position automatic reset, mechanical adjustable-speed drives, threadless linear actuators, right angle gear drives, overhung load adapters for hydraulic motors & pumps, brakes, sizes sae, a, b, c, d, e & f. mechanical phase adjusters for sprockets, timing belts, cams, gears, worm gear reducers.