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 Shackle		  New Topic  Topic Locked
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Downbucket
Navigator

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USA
188 Posts
Initially Posted - 05/20/2008 :  09:20:27  Show Profile
Hi:

For the past few summers I have been using line to tie the end of the boom to the traveler. I am planning to replace the line with a shackle. What type and size shackle is correct?

Thanks.

Will
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 05/20/2008 :  09:39:55  Show Profile  Visit Frank Hopper's Homepage
I like snapshackles on my fiddle blocks.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 05/20/2008 :  10:50:15  Show Profile
Me too.
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redeye
Master Marine Consultant

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3477 Posts
Response Posted - 05/20/2008 :  11:00:28  Show Profile
I'd think a regular shackle should work fine. I'd think a Harken Forged D Part # 2100 with 5/16 inch pin diameter breaking strength of 1620 lbs might be your part.

The Harken catalogue shows most of the fiddle blocks for smaller/medium boats are using a pin diameter of 5/16 but I really don't know what size the catalina 25s are using.

this is just an educated guess from looking at the harken catalogue.

This should be the shackle pin to go through the opening in the end of your fiddle block to secure to the metal plate coming off the end of the boom.

I think the fiddle blocks on the catalinas were schaefer's.

regards.ray

regards.ray
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redeye
Master Marine Consultant

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3477 Posts
Response Posted - 05/20/2008 :  11:40:47  Show Profile
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skrenz
Captain

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USA
351 Posts
Response Posted - 05/20/2008 :  14:21:21  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by redeye</i>
<br /> I'd think a Harken Forged D Part # 2100 with 5/16 inch pin diameter breaking strength of 1620 lbs might be your part.

<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

The pin on the shackle is 3/16" not 5/16". The name on my, I believe original, fiddle block is "Seaway" (never heard of them). A Harken replacement would be the 2132 which has a 3/16" pin and a working load of 1190 pounds. The only problem with the Harken shackles is that the pin is not captive. In other words, it can fall out when unscrewed which can really ruin your day. Wichard makes a shackle of that size with a captive pin. This is 1442. Sold through West Marine as 116178 for $16.99. What will work just fine is the Harken stamped D shackle 072 which costs about $2.99 but uses a split ring which is even more hassle. You could buy and loose 5 of these before buying one Wichard.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 05/20/2008 :  15:29:00  Show Profile
I think using a line there is courting disaster. Chafe could cause a catastropic failure. Use a shackle.
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 05/20/2008 :  19:36:35  Show Profile
Seaway is a vendor Catalina used in the 70's and maybe 80's for it's blocks, single and fiddle. The sheaves and side walls are white. I've still got one Seaway block on my C-22. all the rest have been replaced over the years with Harkin and Shaefer. I use a 57mm Harkin Carbo Airblock with becket off the end of my boom, but I have a 5/16" line coming down from the boom to the block so that the block almost touches the fiddle block when we are fully close hauled. That line eliminates 3 times its length of line that I have to sheet in when I tack.
I'll have to check to see if that line is tied to the tang or a shackle at the boom-end.
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redeye
Master Marine Consultant

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3477 Posts
Response Posted - 05/21/2008 :  06:00:45  Show Profile
So it looks like they used a "stamped" shackle with a captive pin on the original setup.

Looks like that could be a Harken # 072 stamped shackle 3/16 2500 lbs breaking strength.

Ronstan's catalogue shows a 3/16 Clevis pin Shackle.

So that little round ring that holds pins captive is a clevis pin I guess.
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Downbucket
Navigator

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USA
188 Posts
Response Posted - 05/21/2008 :  07:43:24  Show Profile
Thank you everyone.

Will
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Prospector
Master Marine Consultant

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Canada
3159 Posts
Response Posted - 05/21/2008 :  07:51:49  Show Profile  Visit Prospector's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by dmpilc</i>
<br />Seaway is a vendor Catalina used in the 70's and maybe 80's for it's blocks, single and fiddle. <hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

I still have Seaway blocks all over my boat. They work, but seem to have a rougher movement to them than some of th estuff at the local Chandlery.

I think I'll be slowly replacing mine.
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 05/21/2008 :  23:14:17  Show Profile
Checked my boat today. I did add a snap shackle between the line and the tang on the end of the boom. Also, I realize that some Seaway blocks are black with aluminum sides like in the pic above. I still have that same block, as a spare. I'll use it at the bow when I rig up my new A-frame to lower the mast.
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