Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Flat Head Screw Standards
- Thread starter rodneyb
- Start date
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
- Thread starter
- #3
Check out the Unbrako Engineering Guide too:
- Status
Similar threads
- Locked
- Question