Hinge Pin Screw Head Indexing

[quote=Dean Romig;15825]The possibility however, of relatively fast ocurring corrosion would concern me if using aluminum or copper in contact with a dissimilar metal (steel).

Interesting! Aluminum foil or sheet copper should have no problem with contact with any of the carbon range steels used by Parker Bros.

[Autumn Daze]

Francis,The screw shoulders all the way to the hinge pin and the threads are very deep already.The proper way to index the screw without removing the hinge pin would be to remove a few thousands at a time from the back side of the screw head. You will be suprised at how much the screw will move with only a few thousands removed. Go slow...a little at a time...checking constantly....

[quote=Dave Suponski;15848]Francis,The screw shoulders all the way to the hinge pin and the threads are very deep already.The proper way to index the screw without removing the hinge pin would be to remove a few thousands at a time from the back side of the screw head. You will be suprised at how much the screw will move with only a few thousands removed. Go slow...a little at a time...checking constantly....--

I have never removed a hinge pin screw, apparently you have and also refit the screw head to get the proper indexing

[Autumn Daze]

Francis,No I am not aware of any publication for Parker guns the lists screw sizes.Yes I have had a few hinge screws out.They are an extra fine thread a little over .250 in diameter if memory serves....

[Austin W Hogan]

Dave; Are they 1/4 - 24? That is the size of Springfield 1903 trigger gaurd to frame mounting threads. They are designated 1/4 - 24 NS (national special). I was able to buy the taps and dies on special order through Van Hornes Hardware in Fultonville NY to make a T handle set to inlet Springfield Sporters.
I have had a couple of out of register framescrews over the years and wonder how it happens. Perhaps the threaded mate was misaligned after frame recase. This is about the toughest Parker screw to move, and I can think of no reason for it to meander.

Best, Austin

[Autumn Daze]

Austin,If I remember right the TPI is at least 32 or maybe more.

Wonder if the later 1903-A3 series had that NS thread for the tang bolt?