Convert Thou (mils) to Millimeters — Machining & CNC
Formula
mm = thou × 0.0254 (1 thou = 0.001 in)
Why this matters in machining & cnc
A 'thou' (or mil) is one thousandth of an inch, the working unit of shop tolerances. 0.005 in of clearance is 5 thou = 0.127 mm.
Thou (mils) to Millimeters reference table
| Thou (mils) (thou) | Millimeters (mm) |
|---|---|
| 1 | 0.0254 |
| 2 | 0.0508 |
| 5 | 0.127 |
| 10 | 0.254 |
| 20 | 0.508 |
| 50 | 1.27 |
| 100 | 2.54 |
| 250 | 6.35 |
| 500 | 12.7 |