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Tips and Hints
Last Updated
October 1, 2007
| Drill Size |
Decimal
(inch) |
Common Use |
| 1/16 |
0.0625 |
Holes for safety wire |
| 3/32 |
0.0938 |
Pilot holes before final drilling to #40 |
| 40 |
0.0980 |
Holes for 3/32" rivets |
| 1/8 |
0.1250 |
Pilot holes before final drilling to #30 |
| 30 |
0.1285 |
Holes for 1/8" rivets |
| 27 |
0.1440 |
Holes for #6 screws |
| 5/32 |
0.1562 |
Pilot holes before final drilling to #21 |
| 21 |
0.1590 |
Holes for 5/32" rivets |
| 19 |
0.1660 |
Holes for #8 screws |
| 3/16 |
0.1875 |
Pilot holes before final drilling to #12, #11, or #10 |
| 12 |
0.1890 |
Holes for 3/16" rivets |
| 11 |
0.1910 |
Holes for 3/16" bolts |
| 10 |
0.1935 |
Holes for 3/16" bolts in UHMW plastic |
| 1/4 |
0.2500 |
Holes for 1/4" bolts |
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