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Norwegian Krag screws (Read 1567 times)

sixfive KCA Forum Member Offline Krag Enthusiast! Posts: 6 Joined: Dec 1^st, 2019	Norwegian Krag screws Feb 26^th, 2020 at 8:43pm	Print Post
	Hello Krag-Jorgensen enthusiast, Can anyone tell me what thread pattern was used on Norwegian Krag-Jorgensen rifle action screws? Or what thread pattern type/system was used on Norwegian Krag-Jorgensen screws in general? Thanks. Regards, sixfive


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FredC KCA Official Member Offline Krag Enthusiast! Posts: 759 Location: Dewees, Texas Joined: May 31^st, 2013 Gender:	Re: Norwegian Krag screws Reply #1 - Feb 27^th, 2020 at 2:11pm	Print Post
	I have never seen one of these in person. Do you have any samples on hand (even worn or broken would be helpful)? If so I have measuring equipment that I can identify the thread form and identify other critical dimensions critical dimensions.


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Whig KCA Official Member Offline Krag Enthusiast! Posts: 1324 Location: Balt MD Joined: Sep 24^th, 2016 Gender:	Re: Norwegian Krag screws Reply #2 - Feb 27^th, 2020 at 2:54pm	Print Post
	sixfive, I read on another forum the following, if it helps: The krags were developed at a time where the metric (SI) was not yet used commonly (Still not ). The screws are in the BSW *(British Standard Whitworth) Size on the receiver is a mix of nominal metric and inch measures. and: Looked at some action screws (Norwegian Krag) I have. They seem to be 1/4 X 20 tpi.
	« Last Edit: Feb 27^th, 2020 at 6:55pm by Whig »

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FredC KCA Official Member Offline Krag Enthusiast! Posts: 759 Location: Dewees, Texas Joined: May 31^st, 2013 Gender:	Re: Norwegian Krag screws Reply #3 - Feb 27^th, 2020 at 5:48pm	Print Post
	If they are Whitworth the pitch diameter will be different than American unified threads, also the flank angle of the threads is 55 degrees instead of 60 degrees used in all American Unified and metric threads. Never tried one but I doubt they will even screw together, if they do they might work loose with use or some other bad thing might happen or not.


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sixfive KCA Forum Member Offline Krag Enthusiast! Posts: 6 Joined: Dec 1^st, 2019	Re: Norwegian Krag screws Reply #4 - Feb 28^th, 2020 at 12:19am	Print Post
	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


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Whig KCA Official Member Offline Krag Enthusiast! Posts: 1324 Location: Balt MD Joined: Sep 24^th, 2016 Gender:	Re: Norwegian Krag screws Reply #5 - Feb 28^th, 2020 at 12:48am	Print Post
	Good luck with your fabrication. Keep us informed in case anyone here wants to do the same thing.


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sixfive KCA Forum Member Offline Krag Enthusiast! Posts: 6 Joined: Dec 1^st, 2019	Re: Norwegian Krag screws Reply #6 - Feb 28^th, 2020 at 9:36pm	Print Post
	Hello, Well, I tried a 8-32 die for the extractor screw and that did not work at all. It looks like for my purposes I will be sticking with a M4-.75 on the extractor screw, and 1/4-20 threads for the action screws. Since I am just making inletting guide screws and a extractor screw I will not go to the trouble and expense of ordering Whitworth dies at this time. I can't justify it for what I am doing. However if I do ever get my hands on Whitworth dies to try, or get better information on the topic, I will be sure to post my findings. Maybe some more digging in the Krag reference materials will yield some answers. Thanks to all who helped out. Regards, sixfive


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butlersrangers KCA Forum Member Offline Krag Enthusiast! Posts: 6330 Location: Michigan Bi-Peninsular&Proud Joined: Oct 7^th, 2009	Re: Norwegian Krag screws Reply #7 - Feb 28^th, 2020 at 11:19pm	Print Post
	You might check at a knowledgeable bicycle shop for a replacement extractor screw. There could be a relationship to old British Bicycle thread screws.


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