[TheForge] Steel ID question

[Andy Vida]

Bob Ehrenberger wrote:
> 
> This week I had a friend give me a couple hinge pins off of a CAT.  They are
> about 2 1/2" diamiter and 12" long. They come from the point where the blade
> arm connects to the frame.  He said that a few years ago the pins all had
> holes in them for lubrication but now they have gone back to solid.
> 
> Does anyone know what these are made of? I think they would made good hammer
> heads or trip hammer dies, if I knew what they were and how to heat treat.

	Ah, we have a shitload of those at the shop in NJ.  Those are
	probably 4140, though maybe not.  I will call Marshall and
	see if he knows.  I made a bench anvil from one about a year 
	and a half ago before coming out the WA.  I left it there. :(

	Great material for a hammer, but the hole in the center that
	the zyrk fitting screws into for lubrication kinda ruins it.

	I will try to see for certain if he knows what they're made of.

	Another thing is you could call your local CAT dealer and see
	if they can tell you.

	How have you been?  I still have that silicon crystal you sent
	me years ago.  I think it's one of the coolest things I have.

	-Andy