"Jeff Williams" wrote in message
...
Hello,

A friend of mine has broke a stud that holds the blade to his old
chainsaw. He has asked around and the part is nolonger available, it's
basically a threaded double ended stud with a flange/flat part way along.

Anyhow, making the part is not the problem, will prrobably be out of
some C12L14 or 4140 I have laying around.

The question is what can I do to it so it doesn't rust in the normal
environment of a chainsaw? What do they usually do to fasteners to
protect it from the environment? That black finish that isn't paint etc?

Thanks, Jeff

I wouldn't worry too much about rust, but making the stud from 12L14 is
likely a mistake. It's not all that great for tensile strength, and you
can bet your butt the broken one was heat treated. One made from leaded
steel, which is not heat treatable, is likely to fail quickly. Go with
the 4140, even if it's in the annealed condition. Even better would be if
its pre-heat treated. It won't machine as nicely, but your effort won't be
wasted.

Harold