More than 3,700 metric gears and related products are detailed in a 528-page catalog. The "Elements of Gear Technology" reference section covers the principles of involute gearing, gear dimension calculations, definition of back lash, plastic gear design, elements of gear accuracy, principles of surface contact, methods of lubrication, and noise-reduction methods. Product sections give detailed specifications of available products. The products come in sizes from module 0.5 through module 10 in alloy steel, carbon steel, stainless steel, cast iron, aluminum bronze, brass, cast bronze, nylon, and acetal.

Quality Transmission Components, 125 Railroad Ave., Garden City Park, NY 11042, (516) 467-6700, qtcgears. com