fail - finn
- fail safe
- fail safe system
- failure
- failure detection
- failure diagnostics
- failure free
- failure prediction
- failure rate
- fairing
- fall
- falling ball viscosimeter
- falling sphere viscosimeter
- fan
- fan blade
- fan brake
- fan engine
- fang bolt
- far infrared rays
- farad
- faraday effect
- faraday's law of electrolysis
- farm implements
- farm machinery
- farm mechanization
- farm tractor
- farming machine
- fast breeder
- fast fourier analyser
- fast fourier transform
- fast headstock
- fast pulley
- fast reactor
- fast response servo
- fastener
- fastening
- fastening device
- fastening piece
- fatigue
- fatigue bending test
- fatigue crack
