Sub-categories: Power Transmission Parts
- Gearboxes (4720)
- Gears (1227)
- - Bevel Gears (131)
- - Cylindrical Gears (73)
- - Other Gears (481)
- - Pinion Gears (61)
- - Rack Gears (61)
- - Ring Gears (119)
- - Spur Gears (235)
- - Worm Gears (66)
- Pulleys (1176)
- Shaft Couplings (825)
- Speed Reducers (1120)
- Sprockets (380)
- Transmission Belts (612)
- Transmission Chains (612)
- Universal Joints (216)
- Worms (126)