StandMetricThreadsTapDrillsChart.pdf
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American Standard & ISO Metric Thread Sizes & Tap Drills |
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| * Indicates Size of drill to be used before tapping | ||||
| 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 | |
| 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 | |
| 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 | |
| 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″ -14 | 15/16 | M64 x 6 | 58.00 | |
| M68 x 6 | 62.00 | |||