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Re: Broken box lock mainspring
FelixD #504073 02/05/18 05:06 PM
Joined: Oct 2006
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LeFusil Offline
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Most manufacturers use 1070. Temper using molten lead. The kits from brownells and Dixie use 1070. As stated above..1095 isnt ideal.

My new mainspring/cocking limb for a Lancaster body action was hand cut from 1070, filed to shape and hardened/tempered in molten lead. This is probably the hardest working spring in any type of doublegun. It does a lot of heavy work. Its holding up extremely well.
Re: Broken box lock mainspring
FelixD #504085 02/05/18 06:42 PM
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I believe 1095 is a pretty common 'spring' steel, but it probably would benefit from by the book heat treating. Not many will identify the steels used, but I believe there are quality gunmakers that use 1095 for mainsprings. I'd also suspect a little less carbon might be easier to get the home heat treating in the ball park. Even lower carbon content than 1070 might be 5160 that has a good chance of turning up as automotive leaf spring. Options are around, I'd think start with a known steel.
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