Hello,

Thanks for the information.  I had wondered about Whitworth threads as well.  I can't figure out how to post pictures at this point but, I can give some dimensions. 

I am no machinist at all but, I am in the process of making some stock inletting guide screws and a replacement extractor retaining screw for a 1912 and 1894. 

The outside diameter of the action screw threads is .240-.250".  The outside diameter of the extractor screw threads is .150".  At first I did not think a 1/4-20NC die would work for the action screws but after threading some 1/4" rod it appears it threads into the action OK.  Good enough for guide screws anyway.  As for the extractor retaining screw the closest die I found was M4-.75.  It is not a perfect fit but may serve the purpose.

I was just hoping someone might know offhand what the Norwegian Krag-Jorgensen used.  Thanks again for the information and any additional information is greatly appreciated.

Regards,
sixfive