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Old 01-04-2021, 11:20   #1
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Chain to anchor problem

I have 5/16" G4 chain and a Spade 120 anchor. I bought a Titan hi-strength 3/8" anchor shackle which seems good for the chain, but I can't get the bow part onto the anchor, only the pin. I was going to get a 3/8" Titan chain type shackle then a 7/16" hi-strength or 1/2" standard anchor type shackle but I can't find the chain type shackle in hi-strength in the US.

It seems like I need to stick with the 3/8" anchor shackle on the chain and one of the larger anchor shackles on the anchor. I will join the two shackles with the pin of the larger shackle going through the bow of the 3/8"shackle. Any other suggestions?

I don't want a swivel.

Thanks,
Harry
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Old 01-04-2021, 11:24   #2
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Re: Chain to anchor problem

If one size shackle doesn't fit both, then you'll have to use 2 shackles as you described. For high strength shackles, you should be able to find the Crosby G-209A (silver pin).



However, before committing to that option, can you clarify in what way the 3/8" shackle doesn't fit the anchor? Pictures show the Spade having a slot, so I'd expect the 3/8" bow shackle to fit with the bow side through the slot.
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Old 01-04-2021, 11:37   #3
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Re: Chain to anchor problem

Yep, it's a common problem, just put a big shackle on the anchor end.
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Old 01-04-2021, 12:13   #4
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Re: Chain to anchor problem

Not all shackle brands have the exact same dimensions.
If the desired shackle is just slightly too small to fit your anchor, try another brand. You might get lucky.

Steve
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Old 01-04-2021, 13:46   #5
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Re: Chain to anchor problem

Or get a larger hammer.

You are not alone. You'd think anchor manufacturers would design holes that fit shackles.
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Old 01-04-2021, 14:13   #6
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Re: Chain to anchor problem

I just replaced my 5/16” BBB with Acco 5/16” G4 and my 33# galvanized Spade is held with two 7/16” Crosby G-209A shackles. The pins go through the chain and the hole in the shank of the anchor so the two bows bear against one another.
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Old 01-04-2021, 14:35   #7
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Re: Chain to anchor problem

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Originally Posted by Orion Jim View Post
I just replaced my 5/16 BBB with Acco 5/16 G4 and my 33# galvanized Spade is held with two 7/16 Crosby G-209A shackles. The pins go through the chain and the hole in the shank of the anchor so the two bows bear against one another.
Interesting. I was concerned that the 7/16" with a 1/2" pin would be tight since that is the inside minimum width of the ACCO 5/16" G4.

Out of curiosity, why didn't you go with a single 7/16" G-209A shackle. I expect it would have fit with the bow on the shank? It seems like it would be big enough. With the pin through the shank you might induce some side stress on the anchor, theoretically.

Well, I broke out my micrometer. The Titan I bought is only .60" between the ears. The shank on the S120 is .63". The Crosby is supposed to be .661" minimum. Titan doesn't publish that spec so I unfortunately assumed that they would be the same. Maybe I could force it, likely scratching the galvanizing on one or both prematurely, but it looks like there are better alternatives to get the fit right.

Thanks everyone for your input.

Harry
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Old 01-04-2021, 17:44   #8
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Re: Chain to anchor problem

This is one of my pet peeves. Shackles that only fit when they don't match chain ratings. I use a SS bow shackle to connect chain to anchor, and switch it out before crevice corrosion can get to it. PITA, but I hate having a weak link in the form of a smaller galvi shackle, and the rating on the SS one that fits is better.
But anchor manufacturers ought to make bigger holes. How hard can that be?
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Old 01-04-2021, 18:28   #9
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Re: Chain to anchor problem

If I understand correctly, the shackle you have is too narrow to fit through the Spade slot.

Have you tried rolling it into the slot from the top or bottom of the shank? [You likely have, but I wanted to mention it just in case...]

My experience is the Spade slot is pretty generous.

I use a 7/16 Crosby G-209A shackle and the 1/2" pin snugly fits my ACCO G43 chain perfectly. [I can fit the bow of a 5/8" shackle in my S180 Spade, but don't need to.]

If you cannot procure a Crosby shackle in time for your needs, have you considered spreading the ears on the shackle you have, and then pull it back to original size after inserting into the anchor?... [Not ideal... but gets you going...]

In case this is helpful.

Cheers! Bill
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Old 01-04-2021, 19:44   #10
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Re: Chain to anchor problem

This is likely no help for the original poster, but for those who may not have seen this video before, it may be useful.

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Old 01-04-2021, 22:07   #11
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Re: Chain to anchor problem

Run galvanized shackles bow to bow. The pins will run through the chain and the anchor. Very common problem, we do this on our boat too. You can use a bigger shackle on the anchor, usually.
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Old 02-04-2021, 06:10   #12
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Re: Chain to anchor problem

Shackle pins are not rated for side loads only the bow. If pin is inserted into anchor then it is not according to manufacturers specs. Be curious to hear how anchor manufacturers expect connection to be made. I realize oversized shackles used incorrectly could work, but I will certainly check any new anchor for this before purchase.
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Old 02-04-2021, 08:23   #13
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Re: Chain to anchor problem

Has anyone tried Dyneema? A 3/8 soft shackle is probably stronger than the shackle pin.
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Old 02-04-2021, 09:10   #14
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Re: Chain to anchor problem

Quote:
Originally Posted by Benz View Post
This is one of my pet peeves. Shackles that only fit when they don't match chain ratings. I use a SS bow shackle to connect chain to anchor, and switch it out before crevice corrosion can get to it. PITA, but I hate having a weak link in the form of a smaller galvi shackle, and the rating on the SS one that fits is better.
But anchor manufacturers ought to make bigger holes. How hard can that be?
What you don't realize is that the stainless shackle rating is a much higher percentage of its ultimate strength than the galvanized shackle. Despite what you think it IS the weak link in your system, and by a LOT.

The reason they do this is the stainless shackle is NOT rated for lifting loads overhead, so gets away with a much lower safety factor when they calculate working load.

For a given size the galvanized shackle will (almost) always be stronger--even if the WLL rating is lower.

When selecting hardware, you always need to look at the breaking strength, not the working load rating. The problem is shackles made for different purposes will have very different safety factors applied to the breaking strength. If you use only "working load" to guide your selection you will almost always end up with something that is actually WEAKER, not stronger.

This is really a complex situation, and the reason is almost nobody makes things that are specifically "anchor chain" and "anchor shackles." Rather, we suck hind tit compared to other higher volume industries with different priorities.
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Old 02-04-2021, 15:57   #15
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Re: Chain to anchor problem

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Originally Posted by Tomodore View Post
Shackle pins are not rated for side loads only the bow. If pin is inserted into anchor then it is not according to manufacturers specs. Be curious to hear how anchor manufacturers expect connection to be made. I realize oversized shackles used incorrectly could work, but I will certainly check any new anchor for this before purchase.

The shackle should always be of a size that will not allow it to rotate off the proper linear direction of stress. Good thing to check next time I'm at the boat, but I'm almost sure the opening dimension of the bow is small enough on both the anchor shank and the chain, that it can't rotate.
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