How to Measure Screw Size
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Inch Hex Sizes
|
Screw Size
|
No.0
|
No.1
|
No.2
|
No.3
|
No.4
|
No.5
|
No.6
|
No.8
|
No.10
|
1⁄4"
|
5⁄16"
|
3⁄8"
|
7⁄16"
|
1⁄2"
|
9⁄16"
|
5⁄8"
|
3⁄4"
|
7⁄8"
|
1"
|
1 1⁄4"
|
1 1⁄2"
|
|
Dec.Equiv.
|
.060" |
.073" |
.086" |
.099" |
.112" |
.125" |
.138" |
.164" |
.190" |
.250" |
.312" |
.375" |
.437" |
.500" |
.562" |
.625" |
.750" |
.875" |
1.00" |
1.25" |
1.50" |
|
Hex Size
|
.028" |
.035" |
.035" |
.050" |
.050" |
1⁄16" |
1⁄16" |
5⁄64" |
3⁄32" |
1⁄8" |
5⁄32" |
3⁄16" |
7⁄32" |
1⁄4" |
1⁄4" |
5⁄16" |
3⁄8" |
1⁄2" |
9⁄16" |
5⁄8" |
3⁄4" |
Metric Hex Sizes
|
Screw Size
|
M1.6
|
M2
|
M2.5
|
M3
|
M4
|
M5
|
M6
|
M8
|
M10
|
M12
|
M16
|
M20
|
M24
|
M30
|
M36
|
|
Hex Size, mm
|
0.7 |
0.9 |
1.3 |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
12 |
14 |
14 |
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