Power Transmission Distributors Association (PTDA)
The Power Transmission Distributors Association (PTDA) is the leading association for the industrial power transmission/motion control (PT/MC) distribution channel, encompassing a broad variety of mechanical, electrical and fluid-driven equipment such as bearings, belts, drives, motors, gears, couplings, clutches and brakes, linear motion, and hydraulics and pneumatics. PTDA’s members are the companies that distribute and manufacture the components that keep your world running smoothly.
http://www.ptda.org