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Old 09-12-2015, 04:29 PM   #1
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Got a problem

I just purchased 200' of 5/16 G4 chain from West Marine. I bought a Wichard shackle to connect it to the anchor (pic below). The back of the pack says "Functional Limit 1520 KG/3344 LBS" and "Rupture Load 4300 KG/9460 LBS". The chain is rated at 3900 lbs Working Load Limit and 11,600 lbs breaking strength. So all is good until I get home and look more closely at the shackle. It is stamped in the metal WLL 860 KG which is only 1892 lbs.

Soooo I start looking for a shackle that will fit 5/16 chain with a working load close to that of the chain. So far no go. Now I feel like I wasted my money buying G4. What good is it to have a strong chain if the shackle isn't just as strong? Anybody know where I can get a stronger shackle? I called West Marine and the guy looked at every shackle in their catalog and nothing comes close. Even the Acco Anchor Swivel that they say is for use with High Test chain is only rated at 1500 lbs.

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Old 09-12-2015, 04:43 PM   #2
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Try these guys.

http://www.1st-chainsupply.com/attac...pa038alloy.htm
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Old 09-12-2015, 04:54 PM   #3
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Just buy a bigger shackle.
Go to a real marine place that sells stuff to working boats.
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Old 09-12-2015, 04:57 PM   #4
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Just buy a bigger shackle.
Go to a real marine place that sells stuff to working boats.
3/8" is the largest pin that will fit through a 5/16 chain and that is what I bought.
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Old 09-12-2015, 05:02 PM   #5
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Try these guys.

3/8 Alloy SPA Shackles
Thanks Larry but their 3/8 shackle has a 7/16 pin and will not fit through the 5/16 chain.
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Old 09-12-2015, 05:02 PM   #6
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Bummer
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Old 09-12-2015, 05:12 PM   #7
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Working load for a shackle is probably very conservative for rigging safety. See if you can find ultimate strength or failure load. Industrial rigging bits usually identify in terms like that. If this stuff is exciting, a rigging company can test it for you for minimal cost.
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Old 09-12-2015, 05:17 PM   #8
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Not a new issue. If you can find a supplier for connector to match your chain please post it.
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Old 09-12-2015, 05:25 PM   #9
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I believe Crosby makes an alloy 3/8" shackle that will fit.
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Old 09-12-2015, 05:32 PM   #10
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My understanding is that shackles are, by necessity, bi-directionally rated, which will obviously be a lower rating than a straight pull (as used with an anchor).
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Old 09-12-2015, 06:48 PM   #11
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How long is the net opening in the chain? All you need to be able to do is fit the end of the shackle through (it's .9 inch on the alloy Crosby) ; the pin goes through the anchor and the bow through the chain.

Or if you are if that doesn't work for you, try a Dyneema soft shackle(s)
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Old 09-12-2015, 07:00 PM   #12
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The latest Practical Sailer discusses this very problem in detail.

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Old 09-12-2015, 07:21 PM   #13
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This got my curiousity going and according to these guys the Crosby works on 5/16 G4:

https://www.1st-chainsupply.com/chai..._chain.htm#fit chart
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Old 09-12-2015, 08:37 PM   #14
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Here you go

Bow Shackles These are Superior Titanium Bow Shackles
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Old 09-12-2015, 08:44 PM   #15
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You guys have created the problem of yourselves by over-thinking it all, and reading too much fine print. When do you last break and anchor chain or shackle..? Ok, Marin might come up with an example, but by and large, really...how common is it..? I've never heard of it. Just get the biggest sucker that fits through the hole in the chain, and don't bother about what the freaking breaking strain is. Just sleep tight. I'm sorry, you US types are sooooo anal...really...

PS. I meant in the Freudian sense, of course...although having looked at the toilet paper thread...I dunno...
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Old 09-12-2015, 08:57 PM   #16
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Thanks TDunn,

That looks like the ticket, I will order one tomorrow.
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Old 09-12-2015, 10:09 PM   #17
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Crosby Shackles. Excellent product. I think you might need to look up the difference between WLL and breaking load, too, so you are more comfortable.
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Old 09-13-2015, 07:28 AM   #18
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Chain is usually sold by the drum , and each end will have an oversized ling on the end to solve your problem.

Find a real chain supplier , not a retail outlet.
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Old 09-13-2015, 07:58 AM   #19
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Find a real chain supplier , not a retail outlet.
He already bought the chain.
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Old 09-13-2015, 10:06 AM   #20
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I have to go with Pete on this one. In my younger days, I had a heavy towing and rigging company. Broke cable, chain, hooks and even blocks, but never saw a shackle break that was tight, pinned and properly sized for the chain. Miami Cordage has both the cheaper stuff and the good stuff in stock. Ask for Canadian.
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