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Fasteners are measured either overall or
from under the head
Hex Bolts |
Wood Screws |
Machine Screws |
Carriage Bolts
Lag Bolts (Lag Screws) |
Sheet Metal Screws |
Socket Head Products |
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Hex Bolts are measured from under the head to the tip of the
screw
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Wood Screws |
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Countersunk (Flat or Oval head) are measured overall
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Round head screws are measured from under the head
 |
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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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Carriage Bolts |
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Carriage bolts are measured from directly under the head
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Lag Bolts (Lag Screws) |
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Lag Bolts are measured from under the head
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Sheet Metal
Screws |
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Countersunk screws (Flat or Oval) are measured by overall length
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Pan Head, truss head, and Hex Head screws are measured from under the
head
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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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