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Site last updated 9/1/2010
Tap Drill Sizes
Standard Taps
Metric Taps
Tap:
Drill Bit:
Tap:
Drill Bit:
2-
3-
4-
5-
6-
8-
10-
10-
12-
12-
#50
#47
#43
#38
#36
#29
#25
#21
#16
#14
M2 x .4
M2.5 x .45
M3 x .5
M4 x .7
M5 x .8
M6 x .5
M6 x 1
M7 x 1
M8 x .5
M8 x 1
1.6mm
2.05mm
2.5mm
3.3mm
4.2mm
5.5mm
5mm
6mm
7.5mm
7.mm



Standard head screws are measured from thread end to the bottom of the head.
Flat head screws are measured over the entire length.
Button head screws are measured from thread end to the bottom of the head.
Measuring Screw Lengths