Infinite Engineering
Workshop tools · engineer's reference
Workshop tools · engineer's reference
The pocket-book tables, worked out for you. Values come from the ISO standards named on each tab. Click any answer to copy it.
Capitals are holes, lower case are shafts. Choose "none" to look up a hole or shaft on its own.
ISO 286-1 and 286-2 (formerly BS 4500), sizes up to 500 mm. Tolerance grades and fundamental deviations are the standard's tabulated values; plus means above the nominal size, minus means below.
Click a row to load it above.
Type a size, a fraction (17/64), a number drill (#29) or a letter drill (F).
| Drill | Inch | mm | Nearest metric |
|---|
Number and letter drill sizes per ANSI/ASME B94.11M; fractional drills in 1/64" steps to 1". Metric drills assumed in 0.1 mm steps to 13 mm and 0.5 mm steps above.