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post #1 of 8 Old 05-29-2014 Thread Starter
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Cotter ring replacement fitting?

A local rigger helped me splice up my dyneema lifelines last week. While on the boat he noticed my cotter rings in my lifelines and mentioned that I could replace them with "a barrel like pin that is hollow and can be secured from the bottom with an insert that goes up and into the pin." The idea was that the cotter rings could be eliminated.....stopping the potential for snagged lines, sheets, and sails. He is off for the cup, and will be hanging around for a return delivery....might be gone awhile. Can anyone name these "pins" or supply a link? Thanks!
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post #2 of 8 Old 05-29-2014
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Re: Cotter ring replacement fitting?

The nearest thing I can think of is a self-locking or cotterless clevis pin.

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post #3 of 8 Old 05-29-2014
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Re: Cotter ring replacement fitting?

I've only seen these things, never used them, a little pricey and I'm a little leery of hardware with small moving parts in a salt environment.
Jurgan Tool-Free Marine Clevis Pin. By Crealock Development

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Re: Cotter ring replacement fitting?

Lower tech than that.

The barrel pin is hollow and threaded....allowing for the bottom piece to thread up and into to lock. The ends are flat. No moving parts.
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Re: Cotter ring replacement fitting?

I think I found it.....UK though:

Double head clevis pin (316)

Clevis Pin - Double Head - Stainless Steel, Marine Grade 316 | S3i Group | s3i.co.uk

Gotta find a US source.
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post #6 of 8 Old 05-30-2014
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Re: Cotter ring replacement fitting?

Cable Art, Inc. 800-664-4224 sell them. There may be others. Try manufacturers of architectural cable railings.
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post #7 of 8 Old 05-30-2014
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Re: Cotter ring replacement fitting?

Quote:
Originally Posted by SantaAna12 View Post
A local rigger helped me splice up my dyneema lifelines last week. While on the boat he noticed my cotter rings in my lifelines and mentioned that I could replace them with "a barrel like pin that is hollow and can be secured from the bottom with an insert that goes up and into the pin." The idea was that the cotter rings could be eliminated.....stopping the potential for snagged lines, sheets, and sails. He is off for the cup, and will be hanging around for a return delivery....might be gone awhile. Can anyone name these "pins" or supply a link? Thanks!
The advantage of cotter rings is that they can be removed quickly and easily and generally without a tool in the event that one needs to drop the life-lines in a hurry (perhaps when recovering a MOB). The disadvantages are those your rigger pointed out, and the possibility of the rings working themselves off and allowing the pins to loosen or drop out, invariably at the worst of times. In my view, however, the pins you refer to are not a good solution to that problem as one needs an Allen wrench, and may need a pliers, to free them, both of which one might have difficulty coming up with quickly extremis. The Jurgan pins eliminate the need for tools but at rather an extraordinary cost per pin. An alternate solution is simply a couple of wraps of rigging tape that cover the cotter ring. It may need replacement every year or so, but then one needs to inspect the fitting anyway at least that often, no? And, the stuff can easily and quickly be pulled loose to access the ring when necessary.

FWIW...

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Last edited by svHyLyte; 05-30-2014 at 01:29 PM. Reason: Correct spelling
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Re: Cotter ring replacement fitting?

Double-threaded posts like that used to be common for accounting and bookkeeping binders. So they could be removed, extenders added as the binder needed to be thicker, etc.

But as Mark said. And, wtf do you do is that seizes up? Try to grab both ends with two sets of serrated plier jaws?

Nice concept, but I think I'd stick to seizing wire, or rings, and a bit of rigging tape over it.
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