Is there a disadvantage to buying used arp studs - Ford Powerstroke Diesel Forum
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Old 09-21-2010, 10:32 AM
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Is there a disadvantage to buying used arp studs

Hey guys I been seeing some used studs pop up in the forsale that's been torqued once. Is there a disadvantage for once to brand new? Thanks for helping
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Old 09-21-2010, 10:42 AM
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Technically, studs are not supposed to be reused. However there have been MANY people that have done it. I have never heard of a failure atributed to the re use of stud. But if you plan on pushing the limits, dont risk it and get new ones. If its just a moderate build, personally, I wouldnt be afraid of used ones....
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Old 09-21-2010, 10:56 AM
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I believe that they can be reused 3 time according to ARP but don't take that as gospel.
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Old 09-21-2010, 10:56 AM
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Me presonally, with the labor cost for install, I would only want to do this 1 time. So saving a little on the studs now might cost lots later if they fail. Just my .02.
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Old 09-21-2010, 10:59 AM
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The probelm with buying them used is if they have been over torqued then they are FUBAR, and you never know?
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Old 09-21-2010, 11:02 AM
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True I didn't think about them being over torqued. I was just wondering cause it always nice to save money if It is worth it you know
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Old 09-21-2010, 11:05 AM
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I agree that saving money is nice, but there are places you can do that and places where it just isn't worth the little bit it saves you. When you look at the cost of labor to do this job saving $100 on the studs won't make a big difference unless you have to do it twice because of them.
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Old 09-21-2010, 11:10 AM
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Ya understandable I wouldn't want to have to go back and do it again.
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Old 09-21-2010, 07:00 PM
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As my dad always told me, "Don't step over a dollar to pick up a dime". Just my two cents (no pun intended).
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Old 09-21-2010, 07:20 PM
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I have been a stress/structural engineer for 10+ years in the aerospace industry. Head bolts/studs are essentially tension bolts, and our rule on aircraft assembly line is that once tension bolts have been torqued once they are trash if they come off. Especially if they have actually seen service. If the studs have ever been overloaded to the yield point they will not be as good. Metal is not as elastic after it has been yielded once so torquing it to the recommended spec will not yield the same preload in the bolt leading to possible head leaks.
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