| Metric | English | |||||
| Fastener mm |
Drill for |
Drill for tapping mm |
Fastener |
Drill for clearance hole in |
Drill for tapping |
|
| 2 | 2.25 | 1.6 | 6-32 | 9/64 | #36 | |
| 2.5 | 2.75 | 2.05 | 8-32 | 11/64 | #29 | |
| 3 | 3.25 | 2.5 | 10-24 | 13/64 | #25 | |
| 4 | 4.25 | 3.25 | 10-32 | 13/64 | #21 | |
| 5 | 5.25 | 4.25 | 1/4-20 | 17/64 | #7 | |
| 6 | 6.25 | 5 | 5/16-18 | 21/64 | #F | |
| 8 | 8.25 | 6.75 | 3/8-16 | 25/64 | 5/16" | |
| 10 | 10.25 | 8.5 | 7/16-14 | 29/64 | #T | |
| 12 | 12.25 | 10.25 | 1/2-13 | 33/64 | 27/64" | |
| 16 | 16.26 | 14 | 5/8-11 | 41/64 | 17/32" | |
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