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Old 15-07-2018, 11:45   #1
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Are these chain joiners OK?

I have 2 of these joiners on 70m of 10 mm chain. They appear well made and are in good condition. Does anyone recognise them, are they strong enough?

I'm not to happy they are there because in reality they are 1/2 the thickness at the weak points but I have read some threads on here and a couple of tests and some report well, just not sure if these are good ones or not.

The text is 3/8 and 316 (diameter and grade)

The chain is a mix of graded and non graded links.
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Old 15-07-2018, 12:17   #2
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Re: Are these chain joiners OK?

Done a lot of hunting for a decent joiner but then i have considerably more weight of boat
They look like galv but do they have Crosby forged into them?
If not they will be of unknown quality IMHO.

Surely 316 isn't suggesting 316 s/s?
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Old 15-07-2018, 12:50   #3
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Re: Are these chain joiners OK?

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Originally Posted by Simi 60 View Post
Done a lot of hunting for a decent joiner but then i have considerably more weight of boat
They look like galv but do they have Crosby forged into them?
If not they will be of unknown quality IMHO.

Surely 316 isn't suggesting 316 s/s?
Yes. they appear to be stainless when looking at them (not photo), I'm pretty sure the 316 is for the grade.

No 3/8 and 316 are the only markings.
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Old 15-07-2018, 13:19   #4
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Re: Are these chain joiners OK?

You've got a light boat so probably ok, but how much does a 14.8m schionning cost?
New chain and the security it gives is looking cheap in comparison.
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Old 15-07-2018, 13:52   #5
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Re: Are these chain joiners OK?

Suncor Stainless makes links similar to that in both cast and forged. The forged is significantly stronger than the cast. The forged has a rougher surface than the cast. If I had to guess from the photo, I’d say yours was cast.
https://www.suncorstainless.com/links-rings
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Old 15-07-2018, 14:02   #6
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Re: Are these chain joiners OK?

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Suncor Stainless makes links similar to that in both cast and forged. The forged is significantly stronger than the cast. The forged has a rougher surface than the cast. If I had to guess from the photo, I’d say yours was cast.
https://www.suncorstainless.com/links-rings
the cast Suncor links don't seem to have the nomenclature (316 and 3/8) on them, only the forged do, so not likely Suncor cast.

However, many chandleries here in Oz sell links that look like the one in Dave's chain. They are not branded, and it has proven difficult to find out anything about them. I've used a couple for some time and they have not failed or distorted or corroded visibly. I prefer to use forged non-s/s links, but often hard to find here.

Dunno what to advise, Dave, but I have one in my chain... just like yours in appearance.

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Old 15-07-2018, 16:32   #7
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Re: Are these chain joiners OK?

Thanks all.

I think they will do me for now. Before an extended trip to unfamiliar places I might swap all the chain out for some good stuff. I like the idea of the 8mm G70 chain for it's weight saving and similar/greater strength to the 10mm.

Do you think the lighter chain will have much affect on the anchor holding ?


P.S.
I think those photo's may be the wrong way around. The rough joiner is more likely to be cast and the smoother one the forged.
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Old 16-07-2018, 03:27   #8
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Re: Are these chain joiners OK?

Dave,
I just searched on 3/8” 316 SS Chain connector link and found: https://www.e-rigging.com/three-eigh...SABEgK--fD_BwE.

The WLL is reported as 1500lbs.

I searched on 1st Chain Supply on anchor chain. 1/4” HT chain is rated as 2600lb WLL. 1/4” BBB chain is rated as 1300lbs WLL.

Whether or not this link is a “weak link” or not depends on the rest of your rigging and its WLL. I suspect that a non-Stainless Steel connecting link may have a higher WLL.

I have 5/16” HT chain (WLL of 3900lbs) and never felt these chain connectors to be sufficient becausae in order to get the WLL to match, the size of the connector had to be much larger and would not fit the chain link nor the windlass.
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Old 16-07-2018, 08:02   #9
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Re: Are these chain joiners OK?

This type connector will always be a weak link in any high tensile chain. The forged ones like the Suncor Stainless or the Crosby Galvanized will have a working load limit about equal to proof coil (G30) or BBB.

They are significantly weaker than G4 chain.

There is no point in paying for HT chain if you’re going to join it with these links. As the old saying goes, a chain is only as strong as its weakest link.
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Old 16-07-2018, 08:09   #10
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Re: Are these chain joiners OK?

[QUOTE=Dave_S


P.S.
I think those photo's may be the wrong way around. The rough joiner is more likely to be cast and the smoother one the forged.[/QUOTE]

I think they are die cast which would give them a shiny finish. The forged ones would be a little rougher. If I’m right, your links only have a wll of about 1500 lbs.
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Old 16-07-2018, 08:32   #11
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Re: Are these chain joiners OK?

Easy solution stick a magnet on if its 316 stainless it wont stick
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Old 16-07-2018, 08:37   #12
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Re: Are these chain joiners OK?

If the SHTF, you could create a reinforcing soft link out of dyneema.
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Old 16-07-2018, 08:43   #13
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Re: Are these chain joiners OK?

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Easy solution stick a magnet on if its 316 stainless it wont stick


Not necessarily, actually “good” as in strong SS that has been work hardened like forged for instance can be very magnetic, so if you go by the magnet test, often you will be leaving the good, strong stuff on the table and taking the weak cast stuff home.
https://www.kimballphysics.com/magne...ainless-steels
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Old 16-07-2018, 09:33   #14
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Re: Are these chain joiners OK?

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Originally Posted by a64pilot View Post
Not necessarily, actually “good” as in strong SS that has been work hardened like forged for instance can be very magnetic, so if you go by the magnet test, often you will be leaving the good, strong stuff on the table and taking the weak cast stuff home.
https://www.kimballphysics.com/magne...ainless-steels
Vyv Cox of Cox Engineering did a good study of the strength of these joining C-links. Take a look at his website. Conclusion? Go for Crosby every time. I would cut out yr existing and replace w Crosby. I have such a link in my chain. Before & after fitting it i gave it several coats of Zinc spray since have found previously the galv coat on these links ( in this case it was not a Crosby link) is often not as good as rest of the chain so the first 2-3 links each side of the join were sacrificially protecting the link and going rusty. I Zn sprayed the Crosby link as well, just for good measure.
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Old 16-07-2018, 12:26   #15
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Re: Are these chain joiners OK?

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Vyv Cox of Cox Engineering did a good study of the strength of these joining C-links. Take a look at his website. Conclusion? Go for Crosby every time.
Easier said than done.
A lot of things available in the US are not in Australia or other parts of the world.
But we have kangaroos.
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