movi - nitr
- N. Vickers pyramid number
- N.A.
- n.f.
- n.t.h.m.
- nail punch
- nail-making machine
- nailery
- nailing
- naked molten metal
- nameplate
- nanohardness test
- napkin
- nappe
- narrow flame
- narrow-mouthed
- narrowed gamma field
- narrowing
- nat
- National Foundry Association
- National Oxygen and Acetylene Association
- National Slag Association
- National Welding Supply Association
- native argill
- native copper
- native element
- native iron
- native magnesia
- native magnet
- native metal
- natrium
- natrolite
- natron
- natrum
- natural abrasives
- natural ageing alloy
- natural aging
- natural blast humidity
- natural condition (corrosion) test
- natural crystal
- natural crystallographic axis