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Metric Thread Cut Tap Drill Sizes Chart

MetricThreadsChart.pdf

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. 

2 Responses to "Metric Thread Cut Tap Drill Sizes Chart"

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!

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