Question on Grip Screws

ithacaartist · 12-10-2011, 11:51 AM

The way I recall the Whitworth tap I just bought and chased grip screw threads with was listed both ways. BSF=British standard fine, which is the fine version of BSW=British standard Whitworth(coarse thread). So whit.3/16-32 would be the same as 3/16 BSF.
Here's a thought, did the original post seek larger diameter HEADS for the grip screws? I've noticed that this is the case for Erma La-22's; but since I am away from the guns in question, cannot say right now. The Erma grip screws have a significantly larger head diameter, so if thread size and pitch somehow match, they could work where this would be needed--or turned down a tad if the dia. is excessive.
David Parker

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12-10-2011, 11:51 AM	#28
ithacaartist Twice a Lifer Lifetime Forum Patron Join Date: Mar 2011 Location: Atop the highest hill in Schuyler County NY Posts: 3,400 Thanks: 7,555 Thanked 2,643 Times in 1,393 Posts	The way I recall the Whitworth tap I just bought and chased grip screw threads with was listed both ways. BSF=British standard fine, which is the fine version of BSW=British standard Whitworth(coarse thread). So whit.3/16-32 would be the same as 3/16 BSF. Here's a thought, did the original post seek larger diameter HEADS for the grip screws? I've noticed that this is the case for Erma La-22's; but since I am away from the guns in question, cannot say right now. The Erma grip screws have a significantly larger head diameter, so if thread size and pitch somehow match, they could work where this would be needed--or turned down a tad if the dia. is excessive. David Parker