April 3rd, 2012
posted by AutoDrill
| METRIC THREAD CUT TAP DRILL SIZES | ||
| Tap / Thread Size* | Basic Major Diameter | Tap Drill Size** |
| M1.6 x 0.35 | 0.063 | 1.25mm or #55 |
| M2 x 0.4 | 0.0787 | 1.60mm or #52 |
| M2.5 x 0.45 | 0.0984 | 2.05mm or #46 |
| M3 x 0.5 | 0.1181 | 2.50mm or #39 |
| M3.5 x 0.6 | 0.1378 | 2.90mm or #32 |
| M4 x 0.7 | 0.1575 | 3.30mm or #30 |
| M5 x 0.8 | 0.1969 | 4.20mm or #19 |
| M6 x 1 | 0.2362 | 5.00mm or #8 |
| M8 x 1.25 | 0.315 | 6.80mm or H |
| M8 x 1 | 0.315 | 7.00mm or J |
| M10 x 1.5 | 0.3937 | 8.50mm or R |
| M10 x 1.25 | 0.3937 | 8.80mm or 11/32 |
| M12 x 1.75 | 0.4724 | 10.20mm or 13/32 |
| M12 x 1.25 | 0.4724 | 10.80mm or 27/64 |
| M14 x 2 | 0.5512 | 12.00mm or 15/32 |
| M14 x 1.5 | 0.5512 | 12.50mm or 1/2 |
| M16 x 2 | 0.6299 | 14.00mm or 35/64 |
| M16 x 1.5 | 0.6299 | 14.50mm or 37/64 |
| M18 x 2.5 | 0.7087 | 15.50mm or 39/64 |
| M18 x 1.5 | 0.7087 | 16.50mm or 21/32 |
| M20 x 2.5 | 0.7874 | 17.50mm or 11/16 |
| M20 x 1.5 | 0.7874 | 18.50mm or 47/64 |
| M22 x 2.5 | 0.8661 | 19.50mm or 49/64 |
| M22 x 1.5 | 0.8661 | 20.50mm or 13/16 |
| M24 x 3 | 0.9449 | 21.00mm or 53/64 |
| M24 x 2 | 0.9449 | 22.00mm or 7/8 |
| M27 x 3 | 1.063 | 24.00mm or 15/16 |
| M27 x 2 | 1.063 | 25.00mm or 1 |
*Coarse series shown in red.
** Closest size for 75% theoretical thread.
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Ram Kumar Sharma
May 23, 2013 at 6:48 am
Pl. let us know the minor diameter ( Minimum & Maximum)of metric thread M31.50X1.25 mm.
AutoDrill
May 23, 2013 at 7:42 am
Unfortunately, that depends on the tooling and material and desired use of the threads including thread quality.
We suggest asking the tap manufacturer for specific details as we only offer general information.
If you need assistance in India, please e-mail us and we will put you in touch with our dealer / representative in Pune.
Much success!