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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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