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Drilling Guide

METRIC   ENGLISH
Fastener
(mm)
Drill for
clearance hole
(mm)
Drill for
tapping
(mm)
  Fastener
(mm)
Drill for
clearance hole
(in)

Drill for
tapping
(in)

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"