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Reference data you can use, a standard tap drill chart, in inches and milimeters. >  TAP DRILL SIZE CHART FOR STANDARD THREADS
American Standard Thread ...... ISO Metric Thread
Thread Size Tap Drill Size (in.) Thread Size Tap Drill Size(mm)
0-80 3/64 M1 x 0.25 0.75
1-64 53 M1.1 x 0.25 0.85
1-72 53 M1.2 x 0.25 0.95
2-56 51 M1.4 x 0.3 1.10
2-64 50 M1.6 x 0.35 1.25
3-48 5/64 M1.8 x 0.35 1.45
3-56 46 M2 x 0.4 1.60
4-40 43 M2.2 x 0.45 1.75
4-48 42 M2.5 x 0.45 2.05
5-40 39 M3 x 0.5 2.50
Thread Size Tap Drill Size (in.) ...... Thread Size  Tap Drill Size(mm)
5-44 37 M3.5 x 0.6 2.90
6-32 36 M4 x 0.7 3.30
6-40 33 M4.5 x 0.75 3.70
8-32 29 M5 x 0.8 4.20
8-36 29 M6 x 1 5.00
10-24 25 M7 x 1 6.00
10-32 21 M8 x 1.25 6.80
12-24 17 M9 x 1.25 7.80
12-28 15 M10 x 1.5 8.50
1/4-20 7 M11 x 1.5 9.50
Thread Size Tap Drill Size (in.) ...... Thread Size  Tap Drill Size(mm)
1/4-28 3 M12 x 1.75 10.20
5/16-18 F M14 x 2 12.00
5/16-24 I M16 x 2 14.00
3/8-16 5/16 M18 x 2.5 15.50
3/8-24 Q M20 x 2.5 17.50
7/16-14 U M22 x 2.5 19.50
7/16-20 W M24 x 3 21.00
1/2-13 27/64 M27 x 3  24.00
1/2-20 29/64 M30 x 3.5 26.50
9/16-12 31/64 M33 x 3.5 29.50
Thread Size Tap Drill Size (in.) ...... Thread Size  Tap Drill Size(mm)
9/16-18 33/64 M36 x 4 32.00
5/8-11 17/32 M39 x 4 35.00
5/8-18 37/64 M42 x 4.5 37.50
3/4-10 21/32 M45 x 4.5 40.50
3/4-16 11/16 M48 x 5 43.00
7/8-9 49/64 M52 x 5 47.00
7/8-14 13/16 M56 x 5.5 50.50
1"-8 7/8 M60 x 5.5 54.50
1"-12 59/64 M64 x 6 58.00
M68 x 6 62.00






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