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09-12-2015, 03:29 PM
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#1
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Guru
City: Marathon, Florida
Vessel Name: Walkabout
Vessel Model: 1989 Sea Ray 380 Aft Cabin
Join Date: Jan 2012
Posts: 521
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Got a problem
I just purchased 200' of 5/16 G4 chain from West Marine. I bought a Wichard shackle to connect it to the anchor (pic below). The back of the pack says "Functional Limit 1520 KG/3344 LBS" and "Rupture Load 4300 KG/9460 LBS". The chain is rated at 3900 lbs Working Load Limit and 11,600 lbs breaking strength. So all is good until I get home and look more closely at the shackle. It is stamped in the metal WLL 860 KG which is only 1892 lbs.
Soooo I start looking for a shackle that will fit 5/16 chain with a working load close to that of the chain. So far no go. Now I feel like I wasted my money buying G4. What good is it to have a strong chain if the shackle isn't just as strong? Anybody know where I can get a stronger shackle? I called West Marine and the guy looked at every shackle in their catalog and nothing comes close. Even the Acco Anchor Swivel that they say is for use with High Test chain is only rated at 1500 lbs.
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09-12-2015, 03:43 PM
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#2
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,682
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09-12-2015, 03:54 PM
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#3
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Dauntless Award
City: Wrangell, Alaska
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,820
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Just buy a bigger shackle.
Go to a real marine place that sells stuff to working boats.
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09-12-2015, 03:57 PM
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#4
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Guru
City: Marathon, Florida
Vessel Name: Walkabout
Vessel Model: 1989 Sea Ray 380 Aft Cabin
Join Date: Jan 2012
Posts: 521
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Quote:
Originally Posted by Wxx3
Just buy a bigger shackle.
Go to a real marine place that sells stuff to working boats.
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3/8" is the largest pin that will fit through a 5/16 chain and that is what I bought.
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09-12-2015, 04:02 PM
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#5
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Guru
City: Marathon, Florida
Vessel Name: Walkabout
Vessel Model: 1989 Sea Ray 380 Aft Cabin
Join Date: Jan 2012
Posts: 521
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Quote:
Originally Posted by Larry M
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Thanks Larry but their 3/8 shackle has a 7/16 pin and will not fit through the 5/16 chain.
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09-12-2015, 04:02 PM
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#6
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,682
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Bummer
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09-12-2015, 04:12 PM
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#7
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Working load for a shackle is probably very conservative for rigging safety. See if you can find ultimate strength or failure load. Industrial rigging bits usually identify in terms like that. If this stuff is exciting, a rigging company can test it for you for minimal cost.
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09-12-2015, 04:17 PM
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#8
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,186
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Not a new issue. If you can find a supplier for connector to match your chain please post it.
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09-12-2015, 04:25 PM
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#9
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,682
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I believe Crosby makes an alloy 3/8" shackle that will fit.
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09-12-2015, 04:32 PM
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#10
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Moderator Emeritus
City: Cameron, La
Vessel Name: Baobab
Vessel Model: Bayliner 4788
Join Date: Aug 2013
Posts: 2,660
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My understanding is that shackles are, by necessity, bi-directionally rated, which will obviously be a lower rating than a straight pull (as used with an anchor).
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09-12-2015, 05:48 PM
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#11
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Guru
City: North Carolina for now
Join Date: Aug 2011
Posts: 6,348
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How long is the net opening in the chain? All you need to be able to do is fit the end of the shackle through (it's .9 inch on the alloy Crosby) ; the pin goes through the anchor and the bow through the chain.
Or if you are if that doesn't work for you, try a Dyneema soft shackle(s)
__________________
George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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09-12-2015, 06:00 PM
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#12
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Veteran Member
City: Ventura CA
Vessel Name: Proud Mary
Vessel Model: Pacific Trawler
Join Date: Apr 2015
Posts: 92
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The latest Practical Sailer discusses this very problem in detail.
Paul
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09-12-2015, 06:21 PM
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#13
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Guru
City: North Carolina for now
Join Date: Aug 2011
Posts: 6,348
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This got my curiousity going and according to these guys the Crosby works on 5/16 G4:
https://www.1st-chainsupply.com/chai..._chain.htm#fit chart
__________________
George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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09-12-2015, 07:37 PM
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#14
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Guru
City: Maine Coast
Vessel Name: Tortuga
Vessel Model: Nunes Brothers Raised Deck Cruiser
Join Date: Feb 2015
Posts: 889
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09-12-2015, 07:44 PM
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#15
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TF Site Team
City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 10,101
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You guys have created the problem of yourselves by over-thinking it all, and reading too much fine print. When do you last break and anchor chain or shackle..? Ok, Marin might come up with an example, but by and large, really...how common is it..? I've never heard of it. Just get the biggest sucker that fits through the hole in the chain, and don't bother about what the freaking breaking strain is. Just sleep tight. I'm sorry, you US types are sooooo anal...really...
PS. I meant in the Freudian sense, of course...although having looked at the toilet paper thread...I dunno...
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Pete
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09-12-2015, 07:57 PM
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#16
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Guru
City: Marathon, Florida
Vessel Name: Walkabout
Vessel Model: 1989 Sea Ray 380 Aft Cabin
Join Date: Jan 2012
Posts: 521
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Quote:
Originally Posted by TDunn
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Thanks TDunn,
That looks like the ticket, I will order one tomorrow.
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09-12-2015, 09:09 PM
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#17
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Guru
City: Pender Harbour, BC
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,791
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Crosby Shackles. Excellent product. I think you might need to look up the difference between WLL and breaking load, too, so you are more comfortable.
__________________
Don't believe everything that you think.
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09-13-2015, 06:28 AM
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#18
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Guru
Join Date: Oct 2007
Posts: 22,553
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Chain is usually sold by the drum , and each end will have an oversized ling on the end to solve your problem.
Find a real chain supplier , not a retail outlet.
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09-13-2015, 06:58 AM
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#19
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Guru
City: Jacksonville
Vessel Name: SONAS
Vessel Model: Grand Alaskan 53
Join Date: May 2014
Posts: 7,235
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Quote:
Originally Posted by FF
Find a real chain supplier , not a retail outlet.
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He already bought the chain.
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09-13-2015, 09:06 AM
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#20
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Guru
City: Longboat Key, FL
Vessel Name: Bucky
Vessel Model: Krogen Manatee 36 North Sea
Join Date: Oct 2009
Posts: 5,196
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I have to go with Pete on this one. In my younger days, I had a heavy towing and rigging company. Broke cable, chain, hooks and even blocks, but never saw a shackle break that was tight, pinned and properly sized for the chain. Miami Cordage has both the cheaper stuff and the good stuff in stock. Ask for Canadian.
__________________
Larry
"When life gets hard, eat marshmallows”.
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