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Old 22-06-2013, 12:35   #1
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Galvanized Anchor Shackles

Has anyone noticed the breaking strength for galvanized shackles? I was browsing through the specs and was taken back!

The 3/8 shackle I use on our 55lb Rocna and 110' of 3/8 HT chain allegedly breaks at only 2,000 lbs!! The chain has a swl of over twice that. I assume I would hear more about this if people were having their chain break free from their anchor but now I'm looking at upgrading so I can sleep better at night in a blow.

Anyone see an issue with using a ss shackle with a swl more comperable to the chain down there?
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Old 22-06-2013, 12:46   #2
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Re: Galvanized anchor shackles

The specs are OK for good shackles such as those from Crosby. It's the cheap Chinese jobs that have the spec you mention. For example a Crosby HT 3/8 is 2T.
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Old 22-06-2013, 12:46   #3
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Check crosby shackles.http://www.bairstow.com/product/38-c...w-pin-1996.cfm
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Old 22-06-2013, 12:47   #4
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Re: Galvanized anchor shackles

Shocking isn't it. This website by Vyv Cox is worth a read:

Connectors

We use S/S to connect the anchor to the chain but the working load of the shackle would pull the bow under before breaking.

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Old 22-06-2013, 12:47   #5
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Re: Galvanized anchor shackles

You should be able to go up one size with your shackle and still fit the chain (in your case 7/16"). Also, Crosby makes higher strength galvanized shackles that match the strength of HT chain nicely.

G209A CROSBY 2.6TA SPA SHACKLE 7/16"(1017472): Amazon.com: Industrial & Scientific

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Old 22-06-2013, 18:41   #6
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Re: Galvanized anchor shackles

The red screw pins in my Crosby shackles don't seem to be galvanized. They rust.
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Old 22-06-2013, 20:58   #7
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Re: Galvanized anchor shackles

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Originally Posted by wsmurdoch View Post
The red screw pins in my Crosby shackles don't seem to be galvanized. They rust.
I think you got the wrong ones, they have both kinds.
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Old 22-06-2013, 21:45   #8
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Re: Galvanized anchor shackles

Quote:
Originally Posted by McGinnis View Post
Has anyone noticed the breaking strength for galvanized shackles? I was browsing through the specs and was taken back!

The 3/8 shackle I use on our 55lb Rocna and 110' of 3/8 HT chain allegedly breaks at only 2,000 lbs!! The chain has a swl of over twice that. I assume I would hear more about this if people were having their chain break free from their anchor but now I'm looking at upgrading so I can sleep better at night in a blow.

Anyone see an issue with using a ss shackle with a swl more comperable to the chain down there?
I just hope your boat/windlass can withstand 2000# of stress.
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Old 23-06-2013, 03:13   #9
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The best Crosby shackles are all silver - no red pin. 209A I think they label them. They are galvanized.
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Old 27-11-2013, 19:36   #10
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Re: Galvanized anchor shackles

Me too! Need to buy shackles before the next cyclone hits.
Sort of torn between Chicago and Crosby brands...

Found these in 1/2" size to snuggle into my 3/8 HT chain:
Chicago, 1/2" Class 2 Screw Pin Shackle, #20130 8
Chicago, 1/2" Class 3 Bolt Type Shackle, #20630 3

The first is class 2 screw pin, t'other is class three bolt type. Both have working load limits of 4000 Lbs. Both would need seizing wire applied.
{The heck with split-pins under the water out of sight...}

Which of the two styles would you consider "safer" for attachment to an anchor?

And (probably using two of them) which style would you consider to be "safer" for connecting two pieces of equal chain?

Puzzled here... Any ideas? Thoughts?

James
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Old 27-11-2013, 19:43   #11
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Re: Galvanized anchor shackles

Addendum: Connecting two lengths of chain together is only to provide sufficient cyclone/hurricane scope. In case you where wondering...
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Old 27-11-2013, 22:15   #12
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Re: Galvanized anchor shackles

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Originally Posted by svmariane View Post

Puzzled here... Any ideas? Thoughts?

James
They should both be fine from a security point of view. The one on the right stands much less chance of caught on something as it goes over the bow roller. (On a lot of boats the chain passes close to things like the forestay attachment)

I actually use the one on the left but cut off the large eye and drill a small hole for the mousing wire.
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Old 28-11-2013, 04:58   #13
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Re: Galvanized anchor shackles

From Crosby:
“... Bolt-Type Shackles can be used in any application where round pin or screw pin shackles are used ...
Screw Pin Shackles are used in Pick and Place* applications.
For permanent or long-term installations, Crosby recommends the use of bolt type shackles ...”

More ➥ Lift-ItŪ Manufacturing - General Information
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Old 28-11-2013, 05:45   #14
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Re: Galvanized anchor shackles

If your choice is a screw pin shackle, remember to secure the pin with SS wire. Generally in the offshore construction world, screw pin shackles are banned for use.
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Old 28-11-2013, 06:08   #15
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Re: Galvanized anchor shackles

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Originally Posted by bgallinger View Post
If your choice is a screw pin shackle, remember to secure the pin with SS wire. Generally in the offshore construction world, screw pin shackles are banned for use.
I prefer Monel (or Inconel) seizing/mousing wire, which is easier to bend & twist than Stainless, and more corrosion resistant underwater.
The Ormiston & Brookfield Wire companies produce Monel & Inconel seizing wire.
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