OD
(inches)
|
Tap
size
|
OD
(mm)
|
.1575
|
M4
|
4.0
|
.1772
|
M4.5
|
4.5
|
.1875
|
3/16”
|
4.76
|
.1969
|
M5
|
5.0
|
.216
|
12-24
or 12-28
|
5.49
|
.2362
|
M6
|
6.0
|
.250
|
¼”
|
6.35
|
.2756
|
M7
|
7.0
|
.2812
|
9/32”*
|
7.14
|
.295
|
M7.5
|
7.5
|
.3125
or .3150
|
5/16”
or M8
|
7.94
or 8.0
|
.3438
|
11/32”
|
8.73
|
.3543
|
M9
|
9.0
|
.375
|
3/8”
|
9.53
|
.3937
|
M10
|
10.0
|
.4062
|
13/32”*
|
10.32
|
.4375
or .4331
|
7/16
or M11
|
11.1
or 11.0
|
.4688
|
15/32
|
11.9
|
.4724
|
M12
|
12.0
|
*Special thread – a bit harder to find
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