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Thousandth of an inch

Unit of length
A thousandth of an inch is a derived unit of length in a system of units using inches. Equal to 1⁄1000 of an inch, a thousandth is commonly called a thou or, particularly in North America, a mil. The words are shortened forms of the English and... Wikipedia
Unit of measurement: one-thousandth of an inch
1 thou in: is equal to
SI units: 25.4 μm
Symbol: thou, mil