Sub-categories: Power Transmission Parts
- Gearboxes (1071)
- Gears (1931)
- - Bevel Gears (251)
- - Cylindrical Gears (59)
- - Other Gears (756)
- - Pinion Gears (107)
- - Rack Gears (98)
- - Ring Gears (135)
- - Spur Gears (396)
- - Worm Gears (129)
- Pulleys (1033)
- Shaft Couplings (912)
- Speed Reducers (760)
- Sprockets (539)
- Transmission Belts (903)
- Transmission Chains (566)
- Universal Joints (307)
- Worms (106)