"Robin S." wrote in message
...

"Errol Groff" wrote in message
...

25th Edition of Machinery's Handbook, page 1494 shows the following:

Diameter of screw head: .279 max, .228 min.
Angle: 99 to 101 degree included

This for ANSI B18.6.3 - 1972 R1977 flat head machine screws

Doh! What kind of screw was the poster referring to? I don't think
anything
except for a hex socket belongs on a machine, but that's toolmaking...
Flat,
Phillips or socket (or Torx or...?)

Regards,

Robin

Sorry, I forgot to say it is a Phillips screw.

Jim