Equivalence To Other Units of Length
1 thou is exactly equal to:
- 0.001 international inches (1 international inch is equal to 1,000 thou)
- 0.0254 mm, or 25.4 μm (1 millimeter is about equal to 39.37 thou)
For machinists who need to maintain a continual "horse sense" of relative size, a good rule of thumb for quick and sufficiently accurate mental guesstimation is that each millimeter is 40 thou (.040"); a tolerance of plus-or-minus a quarter millimeter is equivalent to plus-or-minus 10 thou; and a micron is almost half a tenth.
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