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Microinch Conversions

A microinch is one millionth of an inch (25.4 nm). It's used to specify surface roughness in machining.

1 µin = 2.54 × 10⁻⁸ m

Convert microinches to other units

Each line shows how much 1 microinch (µin) equals. Select a conversion for a calculator, formula and table.

Metric (SI)

Imperial & US customary

US survey units

Nautical

Astronomical

Atomic & physics

Historical & cloth

Typography

Convert other units to microinches