I have seen Engineers spec out Grade 8 bolts but not very often. I have been a Structural Steel Welding and Bolting inspector for 34 years and in Commyfornia with all of the Earth Quake crap they frown very heavily of the use of a Grade 8 bolt for Structural use. Shear numbers are a whole different story ![]() I've done the recovery thing many times over the years when buds were stuck while we were four wheeling or got into bad situations one way or another when out in the pucky brush and never gave it much thought- but something to think about.Īlso, everyone is posting the listed strength of given bolts and pins but that is in stress- not in shear. I can't seem to find the video at the moment. There is another site on line and I can't remember their name that refutes some of Matt's advice in recovery by showing extreme destructive testing on towing straps, shackles, and other equipment. ![]() Matt also sells some kinetic pulling straps that help with pulling people out of bad situations when brute pulling power won't do it. There are several videos now on this subject and it might be wise to check them out if you intend to do this. it broke, flew through the guy's windshield and killed him on the spot. Matt's Off Road recovery discusses this on several of his videos- especially after the guy was killed about a year ago when somebody used their drop hitch to try to pull somebody out of a mud hole. Thanks again though, its interesting to see the numbers. I know we've bent a few pins and bolts playing silly games and hoping not to win silly prizes, but there's been some instances where bolts sheared too, though for the life of me I can't recall exactly what happened to cause it or the size of the bolts. My layman's take on the shear pins is that they're likely made of soft and tough enough material to bend and not shear in most cases. It's interesting when you mentioned the threads as I can't recall ever seeing a bolt shear off anywhere other than in the threads. One of the cool things about the 'Fire is the breadth of experience and knowledge we've got here.Īs I've admitted numerous times I'm not certified in anything - well that's been kept current for sure - and as mentioned my answer was coming from a background of repeated machinery abuse. Thanks for giving us the math and engineering answer, I appreciate it. Top of the morning to you sir, I trust the first day of March in your section of Colorado is behaving and you're well.
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