You can measure the length and check it against spec to see if they've been permanently deformed or not. Pretty sure I was told they've re-used the standard ARP's in king kong like 8 times or something.
Scientific reason... yeah, if they're permanently deformed, they're weaker, ie, someone cranked on them beyond spec and yielded the material.
That is exactly the answer I was looking for. I wasn't sure if they would snap before yielding, making checking them unnecessary. I don't know what spec is, but I should be able to check them all for variance.
You need a bolt stretch gauge.
You need to torque it to check stretch.
Checking stretch is only accurate if you checked each one new for baseline of that particular bolt/stud.
You need a bolt stretch gauge.
You need to torque it to check stretch.
Checking stretch is only accurate if you checked each one new for baseline of that particular bolt/stud.
At work here we hydraulically stretch studs, which is a much more accurate method. Wish there was an easy way to do it on these really small studs, everything we work with is in the 3"+ area in OD.
If a stud has been permanently stretched, but hasn't yet necked, wouldn't it actually be harder to stretch further than an un-stretched one because of work hardening? And yes, I know it will be more brittle.