Bearingnet
An online sourcing system for rare, unusual, and surplus ball bearings from many distributors worldwide
The Gear Industry Home Page
Gear Technology magazine's online information source, with a directory of gear manufacturing services, including gear machine tools, cutting tools, heat treating and custom gear manufacturing.
The Power Transmission Home Page
Product information, specifications and links to hundreds of manufacturers and distributors of gears, motors, bearings, speed reducers, actuators, drives, sensors, and other mechanical and electrical power transmission components.