4x4 Action Group

I found this great video where they did destruction tests on rated bow shackles, soft yuppie shackles & unrated shackles.

The unrated shackle shat the bed with a load of 4485 kg.



The 8000 kg soft shackle broke at just above it’s rating, 9327 kg



But our favourite & old faithful 4.75T rated bow shackle only gave up at a massive 35219 kg [emoji41]



It just goes to show that the wheel doesn’t need to be reinvented.

https://youtu.be/66BXmM_JuBI

4485Kg is actually a lot. Is that not good enough for our needs?

Thanks for the info

I would not use an un rated shackle, but I am pleasantly surprised with the soft shackles. I can keep them in my recovery bag then

Chris Stoffel wrote:4485Kg is actually a lot. Is that not good enough for our needs?

No, it’s not nearly enough. Mainly because your recovery strap is likely to be rated at 8000 kg or more, which is nearly double the breaking point of that likely projectile.

Mike Nel wrote: I am pleasantly surprised with the soft shackles. I can keep them in my recovery bag then

I’m still skeptical. What snatch rope rating are you using with the Cruiser? 12T? It’ll fail before the strap which isn’t desirable.

Whats the Cruisers GVM?

XJ Junkie wrote: ↑

Sun Nov 04, 2018 5:57 pm

Mike Nel wrote: I am pleasantly surprised with the soft shackles. I can keep them in my recovery bag then

I’m still skeptical. What snatch rope rating are you using with the Cruiser? 12T? It’ll fail before the strap which isn’t desirable.

Whats the Cruisers GVM?

Now that you mention it. My strap is rated at 8Tons which I bought initially for the FJ. The T6 had a 12Ton strap which we used a lot recovering Toyotas. I never replaced it when I got rod of it
I do need a new strap for the Cruiser. Its GVM is roughly 3500kg’s

Add on to the post above

I would rather have a strap and soft shackle coming back at me than a bow shackle
But. Rather make sure you have the right equipment for your vehicle
Thanks for the reminder Neil

This is a very good topic and a brilliant thread. I would love to know the breaking strain of a 3.25T rated shackle... perhaps also 7.4 times the SWL = 24 ton ?

Mike Nel wrote:
I would rather have a strap and soft shackle coming back at me than a bow shackle

But it’ll still have the strap connected to it when it snaps [emoji16]

With any recovery system there has to be a weak point, i.e, the part in the chain that is likely to break first.

Personally, I want it to be the strap. Not the recovery point or the shackle.

Bow shackles actual breaking points are considerably higher than their rating.

Recovery straps/ropes need to be rated at around x2.5 times the GVM of the lighter vehicle in the recovery chain. But using a greater rating strap on a lighter vehicle will interfere with the kinetic properties. That’s why i just use 8T straps.

Very very nice research - about time it was done. I’ve actusllh been threatening it myself for a while .

A SWL rated component is covered by the OHS act. A steel link (chain / shackle ) have to have an actual breaking strain of 6 times it’s rating. Fibre stuff (slings) is 10 times. So I’d expect a rated 4,75 ton shackle to exceed 28,5tons of force before breaking .

But it does make the point - don’t buy cheap rubbish.

F=ma.

So, on the landy an 8T snatch rope will be good?

Sent from my SM-G920F using Tapatalk

Should be fine.

Good thread thanks Neil. There were a case while back on one of the I do work for where a company supplied cheap rated shackles. These failed in a lifting operation , luckily no one were injured. They have put a system in place where all new lifting equipment have to undergo stress tests before allowed being used.

Testing makes sense Grips. I can’t find many videos on actual snatch strap/rope testing though.