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RickW

Length of Screws

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For a Flat Head or Oval Head Machine screw it is measured from the top of the head at the edge to the end of the screw. In other words in a counter sunk type screw like this it's from the top of the head to the end. On a Round head screw with a flat base its from the base of the head to the end.

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Fastener length is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener. Thus, fasteners with heads that sit above the surface are measured from under the head to the end of the fastener, while fasteners that sit flush with the surface are measured from the top of the head to the end of the fastener.

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