Back - Bead
- Back axle
- Back fire
- Back plate
- Back window
- Back-lash
- Back-pressure
- Back-pressure valve
- Backrest
- Backup lamp
- Baffle plate
- Balance (balancing)
- Balance beam
- Balance pipe
- Balance shaft
- Balance weight
- Balanced crankshaft
- Ball and socket joint
- Ball bearing
- Ball thrust bearing
