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Tool Talk Discussion Forum

Piston pins, what kind of steel?

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markiz41

02-08-2008 06:12:15

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All,

I need to replace and set a couple of piston pins on an air compressor. OEM is not available, so I thought I'd make my own since it seems to be a pretty common 5/8 diameter. But the question is: how hard does the steel have to be? Any ideas? Appreciate any info.

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Gerald J.

02-08-2008 10:23:32

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

At McMaster-Carr you can buy dowel pins those sizes or ground to size drill rod or drill bit blanks. All made of good tough steel. You can heat treat the drill rod but will have to grind it to size aftwards. Oil hardening drill rod has pretty good durability without any more heat treatment, but has to be quenched in oil. If you quench it in water, it will split. Water hardening drill is considerably more expensive.

But any hardening heat treat will change the diameter. So use these as is unless you can grind to diameter after heat treatment.

Gerald J.

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Dick L

02-08-2008 08:01:54

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

How long. I have a box of mold ejector pin cutoff's that I would send you for the postage. They are tuff centered with a nitrate hard outside. Should be what the doctor ordered for that.

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markiz41

02-08-2008 08:29:58

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Re: Piston pins, what kind of steel? in reply to Dick L, 02-08-2008 08:01:54

Pistons are 3-1/2 and 1-7/8, so maybe one 3-1/4 long and one 1-5/8 long or any combo will work - I can cut and trim. 5/8 OD. Let me know please. Thank you.

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Dick L

02-08-2008 08:19:11

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Spoke To Soon in reply to Dick L, 02-08-2008 08:01:54

I just checked the boxes of cutoff's and I did not find any 5/8" Plenty of 9/16 and 3/4". They must have used them for support pins and buttons. I didn't see any new 5/8" pins on the shelf.

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markiz41

02-08-2008 08:31:10

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Re: Spoke To Soon in reply to Dick L, 02-08-2008 08:19:11

still appreciated. have a good one.

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Dick L

02-08-2008 09:37:17

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Re: Spoke To Soon in reply to markiz41, 02-08-2008 08:31:10

My tool maker is not here today. I will check with him to see if he might have placed a few 5/8" cutoff's some other place. We have made several molds with 5/8 push back pins. The cutoff's would be short on them though.

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Bob - MI

02-08-2008 07:55:02

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

You should have them RC-50+ on the rockwell scale. The goal is to have them hard enough to resist wear and keep a really fine micro-finish. Finish should be somewhere around 8~16 RMS if you can get it.

You may be better off to see if you can find pins that are already complete and just a bit larger. Have those ground to size on an OD grinder. This way you don't have to screw around with the correct alloy and heat theatment. Centerless grinder would do it too if you can find one available.

8620~8630 would be good choices for alloy.4140 and 4340 also give good wear resistance with 4340 being better to harden. Call a heat treater and see what they run most often as standard cycles for these alloys.

This will help you choose an alloy and a final heat treat condition should you choose to make these from bar.

Best of luck on this one.

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Larry Condon

02-08-2008 07:21:02

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

You have to machine the tool steel in the soft state and have the steel heat treated or harden to the specifications of the type of tool steel used.

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Mike M

02-08-2008 07:19:29

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

When rebuilding my 1936 JD B I was able to buy wrist pins from an engine rebuilder. They had a catalog and we just looked up what would work for an oversize. They were a little long but was able to trim them down with a carbide bit in the lathe. So there are companies that sell them.

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shawnspeed3

02-08-2008 07:17:18

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

I belive most wristpins are made of 8620 tool steel...you may wan't to do a seach on google and find an aftermarket wristpin maker,and maybe they can tell you a X-ref to order....I don't think I would attempt making any unles you have a heat treat oven,and ID /OD grinder, and the knowledge to use them.....Shawn

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coloken

02-08-2008 06:35:18

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 06:12:15

Don't know about making them, but I have softened them in the oven to a nice blue color and they seem to be a high carbon steel. Made a lot of things from them. How about the back end of a 5/8 inch drill bit?

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markiz41

02-08-2008 07:02:15

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Re: Piston pins, what kind of steel? in reply to coloken, 02-08-2008 06:35:18

you saying tool steel is good enough?

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XRogerx

02-08-2008 09:33:27

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Re: Piston pins, what kind of steel? in reply to markiz41, 02-08-2008 07:02:15

I made some out of 4130 and heat treated them with a oxy-actylene setup. I don't know how they held up, as it was a special lash-up for a customer's machine. You should be able to find precision ground shaft in 5/8". I know I replaces an axle pivot bolt in a Suzuki 550 motorcycle once with it. It was dead-on size with the metric original.

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