Listers,
FYI, the so called circular depressions on the head, i.e., the four little
indents around the phillips head slots are there to denote that the screw is
a Unified fastener, 10/32 in this case, versus a British fastener which
would have been 2BA. They are very close but not interchangeable.
So while you can find the correct fasteners at your local hardware store,
don't expect to find then with these markings on the head. Unified British
fasteners were marked during the 1950's to distinguish them from the older
British thread forms that were being phased out, e.g., Whitworth (BSF, BSW,
etc.) and British Association (BA).
On British bolt heads there was an actual circular depression on the heads
of Unified (UNF, UNC) fasteners. Nuts and studs were also marked to denote
the difference.
Cheers,
Curt
On Wed, Dec 15, 2010 at 8:03 PM, john spaur <jmsdarch@sbcglobal.net> wrote:
> Ira,
>
> 3/16 x 3/4" according to the parts book (RPP0312) They are 10-32 chromed
> Phillips oval head screws with a cone point and with circular markings on
> the head.
>
> Regards,
> John
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