THE ACCURATERELOADING.COM GUNSMITHING FORUM


Moderators: jeffeosso
Go
New
Find
Notify
Tools
Reply
  
Heat treat of US Krag's bolt body?
 Login/Join
 
One of Us
posted
What is the alloy used in US Krag rifle bolt bodies? I believe the AISI 1325 used in its receiver is not what is used for its bolt body.

Is the bolt body heat treated uniformly? If it is, briefly describe it. If it is not, what occurred to obtain the Krag's remarkably smooth operation?

Is its [front] locking lug uniformly hardened through the entire lug? If it is not, what is the surface depth of lug's hardening and what is its HRC hardness range?


It's so simple to be wise. Just think of something stupid to say and then don't say it. Sam Levinson
 
Posts: 1525 | Location: Seeley Lake | Registered: 21 November 2007Reply With Quote
One of Us
Picture of dpcd
posted Hide Post
It is made from .55 to .65 carbon and .45 to .55 manganese steel (WD1350) and gets its smooth action from deep case hardening. And with that much carbon it is easy to get a through hardened part; when they went to the 03 Springfield after number 800K they reduced the carbon and increased the MN. And also it's tendency to crack the lug off. Remember that heat treatment in the 1890s and early 1900s was not as scientific as later, and some parts got too brittle; like 03 Springfields. And Krag bolts. Depth of case? deep. Hardness? Hatcher doesn't list it.
 
Posts: 17396 | Location: USA | Registered: 02 August 2009Reply With Quote
one of us
posted Hide Post
You may want to lap in the center rib per de Haas ("Bolt Action Rifles")to duplicate the Norwegian Krag. This will give you double the recoil area. Have the front lug checked for cracks.
 
Posts: 3837 | Location: SC,USA | Registered: 07 March 2002Reply With Quote
  Powered by Social Strata  
 


Copyright December 1997-2023 Accuratereloading.com


Visit our on-line store for AR Memorabilia