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Flat Head Screw Standards
- Thread starter rodneyb
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Rodneyb,
You meant countersink, right?
The ANSI standard is for a maximum theoretical sharp diameter of .172" and a minimum edge of .146". This differs from the metric standard in which the head height is significant, and the diameter is to the outside edge. I have a 1941 drafting book , Engineering Drawing, by Thomas E. French, which quotes a head diameter of .164" without tolerance, for something called American Standard.
Is it possible that your original drafter measured an available screw?
JHG
You meant countersink, right?
The ANSI standard is for a maximum theoretical sharp diameter of .172" and a minimum edge of .146". This differs from the metric standard in which the head height is significant, and the diameter is to the outside edge. I have a 1941 drafting book , Engineering Drawing, by Thomas E. French, which quotes a head diameter of .164" without tolerance, for something called American Standard.
Is it possible that your original drafter measured an available screw?
JHG
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- #3
Check out the Unbrako Engineering Guide too:
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