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Author Topic: Mainspring link  (Read 552 times)

Offline dstock

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Mainspring link
« on: August 11, 2025, 04:49:26 AM »
What material is best for making the mainspring to tumbler link in a lock.
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Doug B

Offline mtlonghunter

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Re: Mainspring link
« Reply #1 on: August 11, 2025, 05:17:37 PM »
A piece of hacksaw blade and two pins. If I understand your question correctly.
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Offline P.W.Berkuta

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Re: Mainspring link
« Reply #2 on: August 11, 2025, 07:40:39 PM »
I've made mine out of O-1 and filed them to shape. No need to heat treat them but you can.
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Offline dstock

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Re: Mainspring link
« Reply #3 on: August 11, 2025, 09:13:02 PM »
So you guys think that there isn't enough stress on that small link to warrant a high strength metal. O1 was my first thought because I have it but was planning on heat treating it to increase strength and wear ability. I appreciate the replies.
Hacksaw blade, hadn't thought about that but could upgrade to larger bandsaw blade. Good thought thanks.
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Doug B

Offline JTR

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Re: Mainspring link
« Reply #4 on: August 11, 2025, 09:42:13 PM »
Given that if that link breaks in use, it will no doubt knock a big chunk of wood out the stock under the lock area, I think I'd error on the side of extra strength.
John
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John Robbins

Offline Bob Roller

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Re: Mainspring link
« Reply #5 on: August 12, 2025, 03:34:22 AM »
I made them from 1018 for decades and no reported problems.A hacksaw blade would be a lot of work and my experience says the integral connection is stronger
Bob Roller
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