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 Post subject: Shroud Anchor Bar
PostPosted: Wed Jul 30, 2014 7:16 am 
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Location: Nepean S.C. Ottawa, Canada
Routine maintenance - I am replacing my shroud anchor pins, and the nylock nuts seem fine.
SRM commented earlier that Hobie now uses an anchor bar # 5010 1701 in place of a nylock.

When did that change take place?

If I elect to keep the nylock, will we deform the shroud anchor plate?
Is this something that I need to order in 'rush' or 'routine'?
(We race once a week, so yes, this is more than social sailing.
SSW 6 knots at 22C, partly cloudy for tonight).

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 Post subject: Re: Shroud Anchor Bar
PostPosted: Wed Jul 30, 2014 9:07 am 
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The specified nut was custom. No longer available. We now list the anchor bar as used on all other models.

I'm sure the nut was a weight savings... the bar works.

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 Post subject: Re: Shroud Anchor Bar
PostPosted: Wed Jul 30, 2014 9:30 am 
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Location: Nepean S.C. Ottawa, Canada
Thanks Matt, for your quick response.
I guess from an engineering perspective, the channel sure makes that joint stronger.

Will be ordering from Fogh Marine tonight.

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1989 Hobie SX18 Sail # 1947
'Only two things are infinite, the universe, and human stupidity. But I'm not sure about the former.'


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Wed Jul 30, 2014 2:34 pm 
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Location: Jersey Shore
Any idea what was special about the nut that required the use of a custom nut? Seems to me a 316SS nyloc nut would do the trick. Maybe just get a heavy hex nut for a little more strength and to fit the channel a little more tightly so it doesn't spin when tightning. The anchor bar seems a little overkill IMO. It's been pretty well established that the failure mode of the anchor is the neck of the bolt itself and not the nut or the threads.

sm


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Wed Jul 30, 2014 3:31 pm 
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Extra large / deep... more threads holding than a standard nut.

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 Post subject: Re: Shroud Anchor Bar
PostPosted: Wed Jul 30, 2014 5:38 pm 
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I'm note sure of the size, but could a standard nut backed by a nylock nut do the job? More threads would be available....


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Thu Jul 31, 2014 2:39 am 
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I would probably go with something like this. Just verify the width fits in the channel and install with some loctite.

http://www.mcmaster.com/#91850a185/=t2nwfv

sm


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Fri Aug 01, 2014 7:01 pm 
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Location: Saratoga Springs, NY
there is something special about either the (original) nut or the shroud anchor pins. The nut that was listed in the catalog as supposedly fitting would bind on the anchor pin threads and destroy them.

Just something to check before you go buy/use a "stock" nut fro McMaster or similar.

Steve

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 Post subject: Re: Shroud Anchor Bar
PostPosted: Sat Aug 02, 2014 6:18 am 
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I don't believe there is anything special about the anchor pin threads. To my knowledge they are 5/16"-18. This is a standard English thread pitch. It's possible the threads galled when you installed the nut causing it to seize to the pin. Or there was some debris left over on the threads from the manfacturing/machining process or you were cross threaded or they gave you the wrong nut (metric?). There is no reason a hex nut from mcmaster or elsewhere should not work. Maybe use a little lube on the threads to prevent galling and definitely do not force the threads if they bind. Its always a good idea to give the threads a quick visual inspection before installing a critical part.

sm


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Sat Aug 02, 2014 7:00 pm 
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SNovak wrote:
there is something special about either the (original) nut or the shroud anchor pins. The nut that was listed in the catalog as supposedly fitting would bind on the anchor pin threads and destroy them.

Just something to check before you go buy/use a "stock" nut fro McMaster or similar.

Steve


The old catalogue needed to be updated, it listed the wrong nut (I think it was Part#8050321 which seized on the anchor pins). The correct nut is Part#8050311 5/16-18 NYLOCK. This is the exact same nut that comes with the rudder stiffening kit. Peace.


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Mon Aug 04, 2014 10:10 am 
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BrianCT wrote:
The old catalogue needed to be updated, it listed the wrong nut (I think it was Part#8050321 which seized on the anchor pins). The correct nut is Part#8050311 5/16-18 NYLOCK. This is the exact same nut that comes with the rudder stiffening kit. Peace.


Not correct...

The (8050311 5/16-18 NYLOCK) nut is not to spec for depth. The original nut, as described by me earlier in this thread, was a heavy duty nut with more thread depth. That is why we decided to just list the anchor bar now... the original nut was no longer available. The anchor bar works great.

The original was NUT 5/16-18 NYLOCK HVY It did not seize... purposefully.

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 Post subject: Re: Shroud Anchor Bar
PostPosted: Tue Aug 05, 2014 3:54 pm 
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mmiller wrote:
BrianCT wrote:
The old catalogue needed to be updated, it listed the wrong nut (I think it was Part#8050321 which seized on the anchor pins). The correct nut is Part#8050311 5/16-18 NYLOCK. This is the exact same nut that comes with the rudder stiffening kit. Peace.


Not correct...

The (8050311 5/16-18 NYLOCK) nut is not to spec for depth. The original nut, as described by me earlier in this thread, was a heavy duty nut with more thread depth. That is why we decided to just list the anchor bar now... the original nut was no longer available. The anchor bar works great.

The original was NUT 5/16-18 NYLOCK HVY It did not seize... purposefully.


Hi Matt, In the past, before the bar was introduced for the 18, you steered us to part#8050311 (see link below. ). I took your advise and the part worked fine - no problems whasoever under fairly heavy use. The nut that seized on the pins, 8050321, did so because it was incorrectly labeled in the OLD catalogue. I know this because it cost me a headache and my dealer two shroud anchor pins. The old catalogue also lists the nut you recommended in the post linked below, 8050311, as the nut for your rudders I.e., the nut that comes (or at least used to come with) with the rudder stiffening kit. Where am I wrong?

viewtopic.php?f=13&t=14013&p=94525&hilit=8050311#p94525


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Tue Aug 05, 2014 4:10 pm 
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We did not list the correct nut... the standard was all we had, but was not really what was designed for the boat.

The bar is the way to go, so correcting bad information that we gave.

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Hobie Cat USA


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 Post subject: Re: Shroud Anchor Bar
PostPosted: Wed Aug 06, 2014 5:57 am 
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Location: Nepean S.C. Ottawa, Canada
No wonder I was confused.....
Glad the issue is resolved.
Parts on order.....

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'Only two things are infinite, the universe, and human stupidity. But I'm not sure about the former.'


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