Mauser 93 trigger guard screws.

[Mauser lover]

Anybody know the thread pitch on the Mauser 1893 trigger guard screws? Looking to get a stainless socket-head cap screw instead of the flathead ones that are available.

I read all over the web that the 98 has 1/4 x 22 screws, but haven't found anyone cough up the info on the 93/94/95 pattern.

Tried measuring with the calipers and counting peaks, but wasn't able to get a good reading on the 3/8" or so of threaded section that the screw has.

 

[boom boom]

1/4-22 Whitworth 55 degree thread same as the m98. Head of screws is larger in the 98 model. You can crosscheck with Brownells looking up Forster Inletting guide screws for example. Product number 319-415-098WB

Via DeHaas,
1/4 - 26 Lee Enfield
1/4 - 25 US Springfield, US Krag
1/4 - 30 US M1917, P-14, Rem 30
1/4 - 32 Win 70, 54
1/4 - 27 Greek Mannlicher Schoenauer
1/4 - 22 93,94,95,96,98 mauser, FN
1/4 - 28 Savage, Rem 700,788 etc, Ruger 77

 

[Mauser lover]

AHA! Thank you! Now I know for sure what I need! Blessings be upon thy head! I should have asked last week and spared my eyeballs the hours of screen time!

Now... to make some Whitworth threads!

 

[boom boom]

AHA! Thank you! Now I know for sure what I need! Blessings be upon thy head! I should have asked last week and spared my eyeballs the hours of screen time!

Now... to make some Whitworth threads!

Brownells has the proper taps and dies for action as well as barrel threads. If you are simply chasing existing threads, usually it is not required to use a Whitworth die or tap. A modern 60 degree usually works as demonstrated by Mauser barrels with 60 degree threads fitting into receivers with 55 Whitworth threading.

 

[Mauser lover]

Nope. Planning on making new screws. My harebrained scheme is as follows:

Acquire 5/16 fine thread stainless screws with hex socket head.
Machine off the threads to get .250" shank.
Cut new threads at 22 TPI, Whitworth. (Might as well make a Whitworth screw as a normal one.)
Turn down head to fit into guard, and contour as desired.
Flame blue to a nice electric blue. Or as close as I can get.

Install and enjoy.

This would all be very easy if B-Square still made their socket head replacement screws.

 

[boom boom]

Nope. Planning on making new screws. My harebrained scheme is as follows:

Acquire 5/16 fine thread stainless screws with hex socket head.
Machine off the threads to get .250" shank.
Cut new threads at 22 TPI, Whitworth. (Might as well make a Whitworth screw as a normal one.)
Turn down head to fit into guard, and contour as desired.
Flame blue to a nice electric blue. Or as close as I can get.

Install and enjoy.

This would all be very easy if B-Square still made their socket head replacement screws.

I suspect that if you made multiples of your screws, you could sell them on ebay for a pretty penny. I've seen the old b-square screws on that site for $10-15 each. Same thing for a lot of old milsurps as the original action screws are drying up in good condition. I paid about $20 bucks for two GEW 88 action screws and the 71/84 action screws go for a lot more. Firing pins are another thing that is in short supply other than Mauser 98's or Springfield 1903 striker/firing pin tips.

 

[Mauser lover]

We'll see. I wish I could find socket head blanks that are .250". The socket size for 1/4 screws is 1/8. For fine thread 5/16 screws (smallest I could get with the shank larger than .250), the socket size is 3/16. Hoping there is enough "meat" there after I turn it all down.

 

[Mauser lover]

Either that or figure out how to cut socket heads. Or better yet, Torx! Alas. I don't think I can do it with my machinery.

 

[Kp321]

At one time Forster also had replacement socket head screws, in addition to B-Square.
Not sure you can get an electric blue on stainless screws. Most bolt store stainless screws are 300 series (high chrome, low carbon, non-magnetic) that is not heat treatable nor will take a color. A good grade eight socket head cap screw is much stronger than stainless and will blue nicely.

 

[boom boom]

At one time Forster also had replacement socket head screws, in addition to B-Square.
Not sure you can get an electric blue on stainless screws. Most bolt store stainless screws are 300 series (high chrome, low carbon, non-magnetic) that is not heat treatable nor will take a color. A good grade eight socket head cap screw is much stronger than stainless and will blue nicely.

Forster still does make the replacement slot type screws but they are not socket heads as was the Bsquare. Those were sought out by folks accurizing Mausers.

 

[BBBBill]

A good grade eight socket head cap screw is much stronger than stainless and will blue nicely.

^^^ This!

 

[Mauser lover]

Too late. Stainless on order. I'll see what I can do. On my rifle it doesn't matter much, either strength or bluing. If it works beyond my wildest dreams and turns out to be easy accomplished and I end up selling some, I will do them in grade eight.