New hardware to eliminate nuts backing off bolts

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Weasel

Weasel

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May 23, 2004
159
Beneteau 331 Iuka, MS
Brothers in Sail:

Found a new piece of hardware that bears checking out. The reason for this is that I have read several instances where the shaft flange nuts have backed off allowing the shaft to disengage from the transmission. With this new nut you can be assured the nuts will not back off due to vibration. I have requested more information on these nuts and will report back when I get it. Meanwhile you may want to check it out yourself.

www.hardlocknut.com

Fair Winds,

Weasel
s/v First Light
 
Tim R.

Tim R.

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May 27, 2004
3,626
Caliber 40 Long Range Cruiser Portland, Maine
First, having all four nuts back off without your knowledge would be surprising. A quick inspection should reveal if any start to move. Also, I would use blue Locktite. The red will require a torch to remove.

Many flanges do not have the clearence to allow for double nuts.
 
Bill Roosa

Bill Roosa

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Jun 6, 2006
6,990
currently boatless wishing Harrington Harbor North, MD
Sounds fishy to me

I'd dito RichH's locktite - red
I see that the use of a cotter pin is indicated as one of those fastiners that backs off??? This would be a bit of overkill IMHO as I have NEVER seen a nut secured by a cotter pin come off and unless you are doing something like draging the thing in the dirt can't imagine one ever failing. The chart at the bottom of the web page indicates that this new technology is greatly superior to even cotter pins. How much more secure can it get beyond "never comes off"???
If you have ever tried to get a red locktited nut off you will know what I mean.
 
Roger Long

Roger Long

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Nov 22, 2008
3,562
Endeavour 32 Portland, Maine
Aircraft, where it is a really, really big deal to have the prop come off, use drilled nut heads and safety wire. That's what I do on my boat. Drilling the heads was simple.

If these nuts are available in the proper stainless, they do look very cool though.
 
kloudie1

kloudie1

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Nov 6, 2006
10,220
Hunter 34 Mandeville Louisiana
Yeah, Red Locktite is like 5200.. Ya gotta be sure that you REALLY don't want it to come loose before using it..
Ya may want to carefully check the flange faces for absolute cleanliness and proper seating, and the engine for alignment .. A flange that might have a rust flake half the thickness of a matchbook cover on one mating face,would want to make the bolts loosen during operation. I find it unusual that the flange bolts would want to get loose just from engine vibes..
 
RON20406

RON20406

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Jan 22, 2008
280
Hunter 25_73-83 NORTH POINT MARINA/WINTHROP HA IL
Weasel, very interesting concept and well detailed and explained in the "Faqs" section. This would be a great concept for remote, inaccessible areas which are difficult to service on a regular maintenance schedule yet need reliable continued use. There are a couple of areas of concern: 1.) reusability and 2.) potential deformation of the eccentricity of the convex nut which could cause failure or reduced performance. I think this is worth a closer look. Great submission. Good sailing, Ron
 
redhead78

redhead78

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Dec 30, 2009
680
jeanneau 38 gin fizz sloop Summer- Keyport Yacht Club, Raritan Bay, NJ, Winter Viking Marina Verplanck, NY
I find the plastic locknuts work great. I ahve them on my drive saver and I don,t see them coming off REd
 
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