Load Rated Anchor Shackle

rnbenton

rnbenton

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How big is big enough?

I just added 60' of 1/4" chain to my rode along with a new stainless steel swivle. The swivel is rated at 750 lbs.

My boat is a 28' Carver Voyager that weighs 10,500 dry and about 12,500 fueled and loaded.

Question: Is a 750 lb rated swivel big enough? I asked the guy (whom I've known for a long time) if this was enough for my boat and he, naturally, said it was more than enough. Now I'm having second thoughts.

I want to make sure it's right before I take off on the 7th to go down and watch the last shuttle launch.

Is there a standard way to figure or a stand "rule of thumb"?

Bob
 
Your chain is probably in the 2k to 3.5k rating range, maybe higher. The shackle really depends on the holding power of the anchor. If you have a really good anchor then you will surpass the rating of the shackle for a boat of your size. If you have a crummy anchor, then the anchor will drag before you surpass the rating of the shackle. Either condition is bad. Get a better shackle, something rated for 2k or higher is my opinion.
 
I use a Manson Supreme anchor.

After puting up the post I decided that if I am having second thoughts then my question has already pretty much answered itself. So, I ordered a heavier swivel with a 2200 lb working load.

I would, however, still be interested in hearing others opinions.

Bob
 
The swivel should be pretty much as strong as the chain... Looking it up, 1/4" chain MWL is 1250lbs so your shackle or swivel should be about that or higher

Having lost an anchor in titusville because of a cheap Suncor swivel, I can tell you to stay away from them... Get the Kong instead
 
quote:
Originally posted by PascalG

Having lost an anchor in titusville because of a cheap Suncor swivel

Click to expand...


I'm going to be in Titusville next week. Want me to look for the anchor?

Bob
 
How do you know the load rate? Is it stamped on the shackle or swivel?
 
In most cases you don't need a swivel. But if you do get one, get a very good/strong one. Not the cheapies.

Stay away from these other than for a very light load.

SuncorSwivel-1.jpg


This is what a Kong swivel looks like. (I use one on my 155 Kg. Rocna.)

kong-anchorswivel-1.jpg


These are nice too and come in smaller sizes.

AnchorSwivel-1.jpg
 
An Anchorlift # 964408 swivel for 1/4" chain specs at 5500 lbs breaking load. They don't mention working load. next larger swivel specs 12500 lbs.
http://www.anchorlift.com/anchors.html

Those conventional jaw & eye swivels tend to be a common failure point on rodes, but mostly because they have been sized inappropriately to match chain size, not equivalent load capacity of the chain, or not replaced before they have deteriorated. A little grease can extend their life a bit as well. J&E type swivels on anchor rodes lose their load capacity faster over time than individual chain links I believe .
 
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