Galvanised Bow Anchor Shackle for 8mm Chain (10mm Pin)

Yellow Ballad

Yellow Ballad

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I bought a couple of 3/8 Crosby G209A shackles to connect my anchor to my 8mm chain but I stupidly didn't look at the measurments that close assuming the pin was 3/8 and being the smallest one they make would be suitable. (Mark, magicalarmchair mentions using these on his blog but doesn't mention chain size). Anyways they wont fit through my 8mm chain having a 11.2mm pin.

I know Vyv uses stainless and I know he says stainless is stronger then the equivalent galvanised and I probably will go that way but can anyone recommend a high rated galvanised shackle that will have a 10mm pin. The AP Lifting yellow shackle seems to have performed well in his tests and APL are not that far from the mothers house so I might pop in next time I'm close as I can't see them online.

There's something inside me that wants to keep it all galvanised but as I mentioned stainless isn't totally off the cards but I would like something thats "decent" / "tested" so looking for recommendations.

Thanks in advance.
 
You are compromising slightly on strength but CMP Titan Black pin shackles (CMP - the people who make Rocna anchors) are about 10% less strong than Crosby' s G209a. So a 3/8th" Black pin has a WLL of 1.8t and a G209A a WLL of 2t. The advantage of the Black Pin are they come in smaller sizes the next size down being 5/16th".

I don't recommend them, because Crosby are better and I did not like the idea that it appeared their QC was lacking. The shackles they originally sold did not meet their own specification. When shown the error of their ways they did reduce their specification from 2t to 1.8t (a an example) - but whether they now test or not -impossible to tell - I'm not their best friend :(

I am not aware of anyone else making a shackle of that sort of size to that sort of strength.

Vyv did suggest widening the end link of your chain, put the end link in a vice and crush it length ways to open it. Being a mild steel it will not impact strength. To do this you need a pretty hefty vice (not something you normally have in your tool box). But if you had one at home and you had access to a pier/pontoon - you could use a vice on the pontoon, taking the chain ashore. Thi would be ideal a it will ue the hackle you already have which are what I'd recommend.

Jonathan
 
Yellow Ballad said:
I bought a couple of 3/8 Crosby G209A shackles to connect my anchor to my 8mm chain but I stupidly didn't look at the measurments that close assuming the pin was 3/8 and being the smallest one they make would be suitable. (Mark, magicalarmchair mentions using these on his blog but doesn't mention chain size). Anyways they wont fit through my 8mm chain having a 11.2mm pin.

I know Vyv uses stainless and I know he says stainless is stronger then the equivalent galvanised and I probably will go that way but can anyone recommend a high rated galvanised shackle that will have a 10mm pin. The AP Lifting yellow shackle seems to have performed well in his tests and APL are not that far from the mothers house so I might pop in next time I'm close as I can't see them online.

There's something inside me that wants to keep it all galvanised but as I mentioned stainless isn't totally off the cards but I would like something thats "decent" / "tested" so looking for recommendations.

Thanks in advance.
Click to expand...

Provided that your chain is galvanized mild steel, and not some fancy grade, just hammer a tapered drift into the end link, until it will accept the shackle pin. It's not rocket science.
 
Anchors and chain are a classic example of SPOFs (Single Point Of Failure). I see little point in joining a chain with a 5 tonne breaking strain to an anchor by means of an 8 tonne BS shackle. The shackle is there to provide a reasonably good articulated means of redirecting the tension of the chain to the top of the shank.

In which case one should be considering the relative merits of D and bow shackles and the many means of securing the shackle bolt to the jaws.
 
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Quick Q for Vyv.

I an understand about steel bar having ductility, and therefore being able to bend. What about the site of the weld in the link ? Is that as ductile as the bar ? If a link is forced 'open' will the site of the weld be a likely point of distress ?
 
sarabande said:
Quick Q for Vyv.

I an understand about steel bar having ductility, and therefore being able to bend. What about the site of the weld in the link ? Is that as ductile as the bar ? If a link is forced 'open' will the site of the weld be a likely point of distress ?
Click to expand...

In most cases the ductility will be very similar. There is a rule, although I do not know whose, that limits the carbon content of anchoring equipment to 0.23%. This prevents the generation of brittle phases by welding.
 
It might be realised already.

To effect Vyv's or Norman's solution (and they seem to be the only sensible ones) may damage the gal - but it does not matter anyway as the last, or first link, corrodes preferentially anyway (and it might do so a bit more quickly). But, in my experience, the first link, or first few links (maybe 3) corrode preferentially and normal practice is to chop them off. If you have needed an enlarged link then you have now chopped it off - and however you did it you now need to do it again, and again. Carry a vice around is not going to be very convenient and a drift is easier but might be more prone to damage the gal - but what ever - you need to anticipate the issues - if you are contemplating a world cruise (not an issue if you never leave home waters).

There is another solution but it needs planning (and usefully would be something to discuss with Geoff of Highland Galvanisers. Galvanise G100 Omega Links - which will fit metric chain, so an 8mm link will fit an 8mm metric chain and use thee Omega as an enlarged end link - you can then virtually use any shackle you want.

Most of the lifting companies make Omega links, including Van Beest - but they are not galvanisied. Galvanising will reduce the rating from G100 to about G70 (which will still be stronger than your chain). The issue is the galvanising and, maybe, Geoff might be sympathetic to galvanising a few, or a batch, that he can then sell.

Omega links are effectively one use only - they use hammer in pins to secure the Clevis Pin - you can take them apart but it takes care and needs the correct sized punches and spare pins to re-assemble. So if this works - buy 2 or 3 at a time. Anyone could galvanised but they would be a bit fiddly - and thus cost. If Geoff came to the party - it might be more cost effective.

Maggi were selling these devices, but they cost an absolute fortune. and were huge. Most from other sources are quite small and neat. I have been using them now for 3 or 4 years without issue but mine are Armorgalv coated. I could have batches coated here - but sending them to Europe is not really sensible.

There might be other options.

Jonathan

edit

See page 234

http://www.vanbeest.com/getattachme...-3d01b0fa2bc1/chapter02_grade10_products.aspx

Omega Links Grade 10. I have not tried the Pear Links

These would be available from any lifting equipment (I'm thinking chains and slings). Gunnebo, Scandanavia, make them etc etc. It will be a bit fiddly to get them galvanised - but once done - easy. Omega links, excluding those from Maggi, are quite small and neat - but in case anyone wonders - I don't think they will pass through any gypsy (so forget joining 2 chains!).

They come painted or powder coated - this need to be removed, paint stripper, applied upto 3 times and then shot blast (or wire brush on angle grinder).

close edit
 
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Edited OP's opening post

And note the title of the thread?

Yellow Ballad said:
There's something inside me that wants to keep it all galvanised but as I mentioned stainless isn't totally off the cards but I would like something thats "decent" / "tested" so looking for recommendations.

Thanks in advance.
Click to expand...

I read the OP's opening post, a I guess did others.

He seemed to be looking for 'gal' options.

I am sure if he finds the answers too focussed he will broaden his queries.

If you feel it appropriate - feel free - no one will criticise you :)

Jonathan

And if you check post 2, someone did as you suggested - why not add your own usage detail. I cannot do so, I have no need for stainless in the rode, gal is good enough. sorry - I now note pot No 2 was from you :)

As I say - I have no usage experience
 
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Because that was not the focus of the thread.

To me, excuse me if I'm simple, the thread was as defined in the title and in some of the first post. The OP seemed to be looking for a 'gal solution' - or the was my interpretation. If the OP had found, or finds, these suggestions unsatisfactory he can ask supplementary questions, or start a new thread.

If you are looking for endorsement of your choice - start a thread with that focus.

There was no suggestion in your post you were unhappy - no one criticised nor contradicted you.

This is the OP's thread - I'm just trying to answer THAT question.

If someone else want to open up the debate, as maybe you are trying to do, well and good.

Jonathan
 
There is another reason to follow the OP's thread title, which might also have influenced the thread.

The OP has 2, slightly too large, Crosby shackles - and these 2 shackles are looking for a home and use. Widening the end link on his chain will cost, hopefully, nothing - and he can use one of his 2 shackles (and keep the other as a spare)

Going the stainless route with shackles of 'similar' strength will cost more money - and leave him with 2 shackles, still looking for home. Iff he follows his 'previous' practice he will be buying 2 stainless shackles, one as a spare (a practice, having a spare, I can endorse)

My suggestion of the Omega links was more focussed a the longer term.

But Norman's drift and Vyv's vice are accepted and don't need money thrown at them (though I'm sure both Vyv and Norman would not object to money being thrown at them :) )

Jonathan
 
Neeves said:
There is another reason to follow the OP's thread title, which might also have influenced the thread.

The OP has 2, slightly too large, Crosby shackles - and these 2 shackles are looking for a home and use. Widening the end link on his chain will cost, hopefully, nothing - and he can use one of his 2 shackles (and keep the other as a spare)

Going the stainless route with shackles of 'similar' strength will cost more money - and leave him with 2 shackles, still looking for home. Iff he follows his 'previous' practice he will be buying 2 stainless shackles, one as a spare (a practice, having a spare, I can endorse)

My suggestion of the Omega links was more focussed a the longer term.

But Norman's drift and Vyv's vice are accepted and don't need money thrown at them (though I'm sure both Vyv and Norman would not object to money being thrown at them :) )

Jonathan
Click to expand...

I'm ready in catching mode. :D
 
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