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Hex Key Chart
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Metric Socket Head Cap Screw Key Information and Head Dimensions
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Screw Size |
M1.6 |
M2 |
M2.5 |
M2.6 |
M3 |
M4 |
M5 |
M6 |
M8 |
M10 |
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Decimal Equiv. |
.063" |
.079" |
.098" |
.102" |
.118" |
.157" |
.197" |
.236" |
.315" |
.394" |
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Hex Key, mm |
1.5 |
1.5 |
2 |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
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Pitch, mm |
0.35 |
0.4 |
0.45 |
0.45 |
0.5 |
0.7 |
0.8 |
1 |
1.25 |
1.5 |
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Head Ht., mm |
1.6 |
2 |
2.5 |
2.6 |
3 |
4 |
5 |
6 |
8 |
10 |
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Head Dia., mm |
3 |
3.8 |
4.5 |
5 |
5.5 |
7 |
8.5 |
10 |
13 |
16 |
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Screw Size |
M12 |
M14 |
M16 |
M18 |
M20 |
M24 |
M30 |
M36 |
M39 |
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Decimal Equiv. |
.472" |
.551" |
.630" |
.709" |
.787" |
.945" |
1.181" |
1.417" |
1.535" |
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Hex Key, mm |
10 |
12 |
14 |
14 |
17 |
19 |
22 |
27 |
27 |
- |
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Pitch, mm |
1.75 |
2 |
2 |
2.5 |
2.5 |
3 |
3.5 |
4 |
- |
- |
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Head Ht., mm |
12 |
14 |
16 |
18 |
20 |
24 |
30 |
36 |
39 |
- |
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Head Dia., mm |
18 |
21 |
24 |
27 |
30 |
36 |
45 |
54 |
- |
- |
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· *Here are some quick formulas to help you get the most from your tools. |
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RPM |
Revolutions per Minute |
= |
(3.82 x SFM) / diameter |
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SFM |
Surface Feet per Minute |
= |
.262 x diameter x RPM |
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IPM |
Inches per Minute |
= |
FPT x RPM x number of flutes(or teeth) |
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Cubic IPM |
Required Horsepower from Machine |
= |
depth x width x IPM |
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FPR |
Feed per Revolution |
= |
IPM / RPM |
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IPM |
Inches per Minute |
= |
RPM x feed (for drilling) |
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FPT |
Feed per Tooth |
= |
FPR / number of teeth |
