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Flat Head Screw Standards

Flat Head Screw Standards

Flat Head Screw Standards

(OP)
Are there anyother common specs for #2 screws other than ASMI? I have a part with a hole spec'd for a #2 flat head counterbore and the diameter is .155?
Thanks,
Rodney

RE: Flat Head Screw Standards

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

RE: Flat Head Screw Standards

(OP)
Sorry, I meant to say countersink. From what I have seen in other spec's is that the 82 degree is .162 and the 100 degree is .172. I got both of those off of McMaster Carr's website and from another publication.
Thanks,
Rodney

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