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

 

Take me to the top