Galvanized Anchor Shackles

[McGinnis]

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?

[model 10]

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.

[sabray]

Check crosby shackles.http://www.bairstow.com/product/38-c...w-pin-1996.cfm

[Pete7]

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.

Pete

[Panope]

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

Steve

[wsmurdoch]

The red screw pins in my Crosby shackles don't seem to be galvanized. They rust.

[model 10]

Originally Posted by wsmurdoch

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.

[delmarrey]

Originally Posted by McGinnis

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.

[SVNeko]

The best Crosby shackles are all silver - no red pin. 209A I think they label them. They are galvanized.

[svmariane]

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

[svmariane]

Addendum: Connecting two lengths of chain together is only to provide sufficient cyclone/hurricane scope. In case you where wondering...

[noelex 77]

Originally Posted by svmariane

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.

[GordMay]

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-It® Manufacturing - General Information

[bgallinger]

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.

[GordMay]

Originally Posted by bgallinger

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.