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Tool Talk Discussion Forum

Making Studs for engine

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Earl S.

05-30-2004 12:27:03




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I have to make some studs for a antique tractor. They are 1/2 dia. Need to torque to 90 ft. lbs. any suggestions on material? Drill rod, cold roll?




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Ears S.

05-30-2004 18:12:26




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 Re: Making Studs for engine in reply to Earl S., 05-30-2004 12:27:03  
Thanks for all your help. I can attack the project Tues.Have a safe holiday. Earl In Illinois



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Ron

05-31-2004 03:31:30




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 Re: Re: Making Studs for engine in reply to Ears S., 05-30-2004 18:12:26  
Before you get started, here's something to think about.

http://www.arp-bolts.com/pages/tech/matspec.html



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Bob

05-30-2004 15:52:33




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 Re: Making Studs for engine in reply to Earl S., 05-30-2004 12:27:03  
A blacksmith/machinest guy I know uses rod he calls "stress proof"... says it's equivalent to grade 8. Shouldn't be hard to find at steel suppliers.



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Davis In SC

05-30-2004 17:11:47




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 Re: Re: Making Studs for engine in reply to Bob, 05-30-2004 15:52:33  
I agree on the "stressproof" I think it is called EPD-150 , also called LaSalle Stress-Proof.This is what we used for Tie-Bars in hydraulic presses. Regards, Davis



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Davis In SC

05-30-2004 17:16:57




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 Re: Re: Re: Making Studs for engine in reply to Davis In SC, 05-30-2004 17:11:47  
An added note on chasing threads on studs..... Try to put as much radius on the tip of chasing tool as you can, & still make thread fit. It will reduce the chance of starting a crack. A cut thread is much weaker than a rolled one , due to the grain flow change that takes place in rolling a thread. Davis



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EarlS.

05-30-2004 15:47:36




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 Re: Making Studs for engine in reply to Earl S., 05-30-2004 12:27:03  
I had checked in McMasters and the Auto Supply.They are head studs for a F-30 IHC .The thread that screws in the block(1/2-13)have to be a little larger to seal off water and a tight fit is required in that old cast iron.They are 9 7/8 long and I can cut the threads on my lathe if I knew what to make them out of.Most of studs I have found are too short and are grade 5. Thank you for your interest. Earl

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George

05-30-2004 14:43:46




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 Re: Making Studs for engine in reply to Earl S., 05-30-2004 12:27:03  
I assume you are asking about head studs -- If they are for something like a JD, I'd order then through the dealer then you know you are getting studs designed for the application (alloy, heat treat, etc). If not, you run the risk of blowing a head gasket, warping the head, etc.



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Joe (Wa)

05-30-2004 15:13:19




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 Re: Re: Making Studs for engine in reply to George, 05-30-2004 14:43:46  
Whoa! Never even considered cylinder head studs!
Even for a standard application change that grade 5 in my post to grade 8 for 90 ft lb. Sorry for the lapse and bum answer. Joe



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Joe (Wa)

05-30-2004 14:37:37




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 Re: Making Studs for engine in reply to Earl S., 05-30-2004 12:27:03  
Buy some grade 5 bolts that will be the proper length after the cap is cut off. You already have the threaded end for the nut.

A normal quality stud will have class 4 thread on the other end but it really isn't necessary for most applications.

Joe



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Bob

05-30-2004 12:52:02




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 Re: Making Studs for engine in reply to Earl S., 05-30-2004 12:27:03  
NAPA and other auto parts stores will have them, or can get them in common lengths. On the internet, McMaster-Carr has them. Very reasonable.



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