Metric Thread Cut Tap Drill Sizes Chart

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