Drill Size Chart
— rows
showing mm
All 436 standard drill sizes in one sortable place: metric (0.1–50.5 mm), number/wire gauge (#1–#100), letter (A–Z) and fractional (to 1/64 in and finer) series, each with its exact decimal-inch and millimetre equivalent. Search by decimal (search 0.257 to get the nearest drills above and below), designation (#7, F, 6.8 mm, 27/64) or series name.
| Drill size | Diameter (in) | Diameter (mm) |
|---|
No drill sizes match that search.
Fractional diameters are exact fractions and metric conversions use 25.4 mm per inch; number and letter diameters are checked against public references, including Lawrence Berkeley National Laboratory's conversion tables, and follow the ANSI/ASME B94.11M sequence.