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Fasteners are measured either overall or from under the head
If measuring with a U.S. measuring tool you can
use this chart
for conversion.
Metric Hex Bolts |
Metric Machine Screws |
Metric Socket Products |
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Hex Bolts are measured from under the head to the tip of the
screw
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Metric Machine Screws |
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Countersunk (Flat or Oval) is measured overall
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Pan Head or Round Head screws are measured from under the head
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Metric Socket Head Products |
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Flat Socket Caps are measured by the overall length
 |
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Socket Head Caps and Button Head Caps are measured from under the head
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