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As far as rigging onsite yes many riggers usually seat the pin then back off 1/4 turn. If used like this the rigger and/ or the site the pin would be moused so that it does not come loose. Now i do know riggers who do this as thats how they were taught etc and i agree it is wrong.
Depending on who you ask the usual reason they give for backing off is to stop the pin from binding. The shackle should be derated when used like this though and again should be moused.
As far as a safety chain on a trailer that again is different to a recovery. I do remember a time where they didnt really have much of a regulation regarding this other than it needed to be there and connected to the vehicle. I also agree that using rated shackles was to control a quality issue of what was being used in the past. Same with T grade chain now being used. Yes they asses it this way to breaking strain instead of SWL
Im hoping you mean a much larger shackle that 8.5t though cos they only weigh about 2.5kg though.
The biggest issue there is, is that there is no set guidelines or rulings other than manufacturer recommendations.
Even Nobles guide on recovery is very basic. For those who dont know Nobles is a provider of rigging gear and NATA certified tester. So basically anything to do with loads they are the people to talk to.
Link to their guide. https://www.nobles.com.au/Admin/Publ...are+in+Use.pdf
@GQtdauto yes there is no set calculations for you being bogged deep in mud, sand or any other way you can get stuck. Hence why these recoveries are so dangerous. Who knows if your vehicle is going to pop out nice and easy with a gentle pull or get hung up on that hidden tree trunk in the mud no one has noticed. Is your mate pulling you out slightly sideways from you and not dead straight on. This is exactly why i say recoveries are rigging as you should be derating gear due to the variables faced as well as having some understanding of angle factors, safe use of gear and the understanding of what may go wrong and how.shackle_side_load_chartandillustration.jpeg
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