Hex Key Chart
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 |
Decimal Equiv. | .063" | .079" | .098" | .102" | .118" | .157" | .197" | .236" | .315" | .394" |
Hex Key, mm | 1.5 | 1.5 | 2 | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 |
Pitch, mm | 0.35 | 0.4 | 0.45 | 0.45 | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
Head Ht., mm | 1.6 | 2 | 2.5 | 2.6 | 3 | 4 | 5 | 6 | 8 | 10 |
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" | |
Hex Key, mm | 10 | 12 | 14 | 14 | 17 | 19 | 22 | 27 | 27 | - |
Pitch, mm | 1.75 | 2 | 2 | 2.5 | 2.5 | 3 | 3.5 | 4 | - | - |
Head Ht., mm | 12 | 14 | 16 | 18 | 20 | 24 | 30 | 36 | 39 | - |
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. | |||
RPM | Revolutions per Minute | = | (3.82 x SFM) / diameter |
SFM | Surface Feet per Minute | = | .262 x diameter x RPM |
IPM | Inches per Minute | = | FPT x RPM x number of flutes(or teeth) |
Cubic IPM | Required Horsepower from Machine | = | depth x width x IPM |
FPR | Feed per Revolution | = | IPM / RPM |
IPM | Inches per Minute | = | RPM x feed (for drilling) |
FPT | Feed per Tooth | = | FPR / number of teeth |
