linkage pin material

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linkage pin material

Post by thunderskunk » Sat Jun 08, 2019 6:24 pm

Hey folks,

What material do you use for the pins connecting linkages, rods, and such?

I was thinking of cheating and buying some gage pins since they're already hardened. They're tough to work with, but not impossible. Grind off the ends, drill and tap through, then loctite some castle-nut looking bolts on the outsides with a flat-headed bolt on the inside. Better yet, they make some reeeealy tiny oil embedded bushings that could work with some softer materials as pins.

Thanks for the input either way.
"We'll cross that bridge once we realize nobody ever built one."

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Re: linkage pin material

Post by Fred_V » Sun Jun 09, 2019 8:33 am

I have been using Drill rod for the wrist pins and crank pins. It is easy to machine and wears well without hardening.
Fred V
Pensacola, Fl.

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Re: linkage pin material

Post by JBodenmann » Sun Jun 09, 2019 10:01 am

Hello My Friends
One way to make little pins is to make them from L series steel and then case harden them. Even though this steel machines like butter you can case harden it and it will last and last. You can harden them with Kasenit or Cherry Red, which is available from McMaster. I have used this for things like the front end throttle linkage on the Nickel Plate Berkshires and New York Central Hudsons. These pins are tiny and any slop is multiplied as there are at least four of them. Also with tiny pins like this make the bushings from something tough like phosphor or silicons bronze. This is just how I do it, the other suggestions sounded good too.

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Re: linkage pin material

Post by piedmontg » Sun Jun 09, 2019 1:38 pm

I have been using 1144 which is C23 in unhardened state, machines and threads nice. It is harder than O1 which is B85 in unhardened state. Data from McMaster charts.


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Re: linkage pin material

Post by mattmason » Mon Jul 01, 2019 11:28 am

Same as Fred. Drill rod. I don’t harden them and the oil bronze bushings wear faster and I haven’t seen any pin wear on my loco.
Matt Mason

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Re: linkage pin material

Post by hoppercar » Thu Jul 04, 2019 4:05 pm

drill rod is good...or I use 4140 prehard

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