Snatch strap testing

Submitted: Friday, Jan 23, 2009 at 18:51
ThreadID: 65364 Views:3322 Replies:6 FollowUps:20
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A4WDM did a snatch strap test recently and have just posted a short video of then breaking. Take a close look at the end of the clip, see that stitching,? If yours looks anything like that then replace it now.



Bang goes the snatchie.
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Reply By: Sigmund - Friday, Jan 23, 2009 at 19:25

Friday, Jan 23, 2009 at 19:25
Do you know what the breaking strain was?
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Follow Up By: Bonz (Vic) - Respectfully- Saturday, Jan 24, 2009 at 14:21

Saturday, Jan 24, 2009 at 14:21
They tested 18 straps Sigmund and most of them broke at 4-20% greater than their rated load. e.g. a 8000kg strap broke at 8800kg would be a +10% result and lots of them bettered their ratings.

Thats good news for users.

They also tested twisted straps, muddy straps, and knotted straps, they called this "real world" testing with varying results.

Go get the mag of your interested its not a bad read.
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Follow Up By: Sigmund - Saturday, Jan 24, 2009 at 17:55

Saturday, Jan 24, 2009 at 17:55
Thanks.

Did a Google; found one reported result, but from a diff test I'd guess.

Black Rat separated at c. 7200 kg, and was rated as a fail by the testers.

But shouldn't be a prob for a mouse in a Forester should it?
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Follow Up By: Mad Cowz (VIC) - Monday, Jan 26, 2009 at 19:24

Monday, Jan 26, 2009 at 19:24
they did this test a few years ago and did the "blacksanke" did they do it again?
it went miles past it's rating then, so much so they got well away from the test area as they wanted to be nowhere near it when it broke.

I've broken a strap or 3 and none of them went off with that bang.... maybe I couldn't hear it over the tractor noise.....

MC
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Reply By: Member - Bevan (QLD) - Friday, Jan 23, 2009 at 21:25

Friday, Jan 23, 2009 at 21:25
that went off with a bang didnt it, i have seen the go off with a d shackle attached to it, went into the window of the toyota in my profile pic while trying to get it out of that bog, and you could not even see it, just head it. was told that the straps are only good for 10 snatchs
AnswerID: 345682

Follow Up By: Member - Kiwi Kia - Saturday, Jan 24, 2009 at 07:30

Saturday, Jan 24, 2009 at 07:30
Hi Bevan,

So what actually broke ? If the strap had a shackle attached then it was not the strap but something that it was attached to on a vehicle that broke.

Or, surely you don't meant that someone joined straps together using a shackle !

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Follow Up By: Member - Kiwi Kia - Saturday, Jan 24, 2009 at 07:31

Saturday, Jan 24, 2009 at 07:31
PS. There is no such restriction (10 snatches) it's an old wives tale.

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Follow Up By: Bonz (Vic) - Respectfully- Saturday, Jan 24, 2009 at 07:43

Saturday, Jan 24, 2009 at 07:43
Hey Ray, We have had a weld break on a work vehicle break when snatching it out of a bog. The Dee, the mounting bracket and several metres of cable and rope then took off straight thru the back of the pulling vehicle - very nasty.
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Follow Up By: Member - Kiwi Kia - Saturday, Jan 24, 2009 at 08:32

Saturday, Jan 24, 2009 at 08:32
Hi Bonz, I have been involved with some hook testing and found that all the 'rated' hooks we tested came up to spec. We demand that only rated forged hooks be used as the forged hooks 'unwind' and do not break. The last thing we want to see is metal flying through the air so we pay a lot of attention to attachment of the hooks including installing crush tubes inside the chassis rails and dbl plating on thin wall chassis. There are some vehicles that we don't allow the oem 'recovery' points to be used and they have to be replaced. It seems that Beavn was most likely referring to a snatch from a tie-down rather then a properly constructed recovery point. I would also like to know at what tension the strap broke. We hope that straps act like a fuse and break before metal flies !

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Follow Up By: Bonz (Vic) - Respectfully- Saturday, Jan 24, 2009 at 14:23

Saturday, Jan 24, 2009 at 14:23
They tested 18 straps Ray, and most of them broke at 4-20% greater than their rated load. e.g. a 8000kg strap broke at 8800kg would be a +10% result and lots of them bettered their ratings.

Thats good news for use

They also tested twisted straps, muddy straps, and knotted straps, they called this "real world" testing with varying results.

Go get the mag of your interested its not a bad read.

The bow shackle they used showed absolutely no signs of wear at all. They tested them on the same rig a few years ago and they were breaking at 6 times their rated SWL.
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Follow Up By: Member - Kiwi Kia - Saturday, Jan 24, 2009 at 16:53

Saturday, Jan 24, 2009 at 16:53
Thanks Bonz, Would you be interested in our hook test results ?
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Follow Up By: Bonz (Vic) - Respectfully- Saturday, Jan 24, 2009 at 17:37

Saturday, Jan 24, 2009 at 17:37
Yes Ray sure would
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Follow Up By: Member - Bevan (QLD) - Sunday, Jan 25, 2009 at 01:50

Sunday, Jan 25, 2009 at 01:50
Hey Kiwi, a mate of mine thought he knew it all and hooked it on to a thing under his tray and it ripped out, mind you i took 10 good hit to do it, but i was telling him it was no good, but he wouldnt listin, and my other mate wore a broken wind screen. the same bloke who though he knew it all thought when you get bogged it deep water you keep the engine running, lucky his car shut its self down cos there was some water drops in the intake pipe of his deisel hilux.
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Follow Up By: Member - Kiwi Kia - Sunday, Jan 25, 2009 at 06:57

Sunday, Jan 25, 2009 at 06:57
Hi Bevan, Thanks for that info. I am always very interested to see if there is a lesson to be learnt from snatch recoveries that go wrong. I wonder how many people actually know just what the manufacturers recommendations are for the use of these straps ?

You may like to have a look at the following video;

http://www.youtube.com/watch?v=YR22oP1WRtY

Note the shackle that has passed right through the side wall of the spare tyre !

This was a training session and the people had paid for the lesson. A Troopy was deliberately bogged and then several failed attempts were made to recover it before the result that you see in the video.

I corresponded with the guy that took the video and it seems that there was probably a bit to much 'gung-ho' attitude plus the attachment to the Troopy was on the standard loop so-called 'recovery point' and not a properly attached hook.

.

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Follow Up By: Bonz (Vic) - Respectfully- Sunday, Jan 25, 2009 at 07:10

Sunday, Jan 25, 2009 at 07:10
This one

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Reply By: Roughasguts - Friday, Jan 23, 2009 at 22:15

Friday, Jan 23, 2009 at 22:15
There not really using that strap as intended though are they.
EG; between two cars that give a little or at least move a few inchess when pulled.
AnswerID: 345686

Follow Up By: Grungle - Saturday, Jan 24, 2009 at 08:15

Saturday, Jan 24, 2009 at 08:15
True, but when a strap is developed, this is the only certain way to test its breaking strain. Sure they will batch test to ensure that they have a strap that consistantly meets the stipulated rating so not every strap is tested but if consistant results are achieved then it can be safely assumed that all straps will meet or exceed their rating.

One thing that the magazine testers did was put a strain gauge on the tow point of the vehicle and did a multitude of tests involving recoveries in different terains including sand, mud, dirt, inclined etc. This gave a very accurate indication of actual force required to shift a vehicle.

They even went as far as to test the effects of a wet / muddy strap, frayed strap, old strap etc to see how age and environmental exposure affected the straps.

Overall I don't think you could have done a more comprehensive test.

One thing that impressed me was that they had run this test a year or 2 ago and nearly 50% of all straps (including ARB and a couple of other well know ones) failed to meet their specified rating. Manafacturers instantly stood up and took notice and now we have very few that didn't meet their specified rating.

This was a great test to 1. inform the public on the do's and don'ts of using a snatch strap and detailed information on their design and intended purpose and 2. ensure the industry keep on their toes by constatly testing and improving their quality control.

Regards
David
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Reply By: Member - Phil G (SA) - Friday, Jan 23, 2009 at 22:45

Friday, Jan 23, 2009 at 22:45
Its good to see a magazine spend some money on some objective testing, which largely confirm the manufacturer's ratings.

But I hope people don't react by buying bigger stronger straps. The strap has to be the weakest link. A broken snatch strap is a lot safer than a broken recovery point.
AnswerID: 345691

Reply By: Member - Jeff H (QLD) - Saturday, Jan 24, 2009 at 00:52

Saturday, Jan 24, 2009 at 00:52
Thanks for that Bonz. The way that stitching failed reminded me of temperature effects on fishing line. I'll store the spare straps in the house rather than the shed. (Probly too flamin late anyway.)

Hey, anyone in the market for a few Black Rat straps - still in original packaging - all idiot offers considered - ...
(phone Bonze. with an 'e').

Jeff H.
AnswerID: 345701

Follow Up By: Sigmund - Saturday, Jan 24, 2009 at 05:39

Saturday, Jan 24, 2009 at 05:39
Yeah I'm interested in one.

Email me at rsser at westnet dot com dot au
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Follow Up By: Bonz (Vic) - Respectfully- Saturday, Jan 24, 2009 at 07:44

Saturday, Jan 24, 2009 at 07:44
I think he's pulling your leg Sigmund
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Follow Up By: Sigmund - Saturday, Jan 24, 2009 at 09:05

Saturday, Jan 24, 2009 at 09:05
Was gunna offer him a sock.
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Follow Up By: Bonz (Vic) - Respectfully- Saturday, Jan 24, 2009 at 10:02

Saturday, Jan 24, 2009 at 10:02
I am in need of a sock
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Follow Up By: Sigmund - Saturday, Jan 24, 2009 at 17:50

Saturday, Jan 24, 2009 at 17:50
Cool. Got a wide selection.

Will swap for a snatch strap.
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Reply By: Ozboc - Monday, Jan 26, 2009 at 10:06

Monday, Jan 26, 2009 at 10:06
I would actually be interested in seeing a snatch strap being tested AFTER it has been used number of time in various situations , Ie been submerged in mud , or exposed to x amount of sunlight or 3 months of usage

would like to see if the results would be the same or a Huge difference in breaking strain

Boc
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Follow Up By: Bonz (Vic) - Respectfully- Tuesday, Jan 27, 2009 at 18:24

Tuesday, Jan 27, 2009 at 18:24
Go get the mag Ozboc, they did these tests too
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