Winch hook capacity

[cranetruck]

Bjorn,
That is interesting, considering that I have never seen 5/8 chain used on the 20Kwinch. It is always 1/2" chain................ The hooks, for 1/2" chain should spread before the chain fails, this is by design to prevent chain failure in pure pull and the resulting flying parts........

According to this theory, the chain/hook hardware should be 3/8 inch (at right in the image below) for the 10,000 lb deuce winch....

I'm aware of the safety factors, SWL, WLL and breaking strength .

Edit: It would be nice to have decals made (Gary Berg?) with the winch capacity as shown in 1st and 2nd image below.

 

[rizzo]

Thanks.
Found confirming data in TM 5-725 "Rigging".

So, the 10-ton snatch block is pretty much a necessity for the 20,000lb winches.

I just looked at my 818 and it is a 1/2 chain and hook. the chain is an alloy L8 rated at 12k in my Campbell book. hook is rated the same.

these ratings are with a design factor of 4 to 1. WLL would be 16k if it had the 3 to 1 factor.

still not what the winch is rated at ??

 

[rmgill]

You know, when John Waller was helping with the Dingo Recovery a few weeks ago, I seem to recall when I was re-stowing his winch hook that his hook and chain on his M818 were a LOT larger than the hook/chain are on my M35.

 

[cranetruck]

An update. Image now includes the 5/8 inch chain w/grab hook, which is really needed for the 20,000lb winch. (Got it from a parts M543 wrecker in Mt Airy, NC this morning.)