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Old 11-11-2014, 10:40   #16
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

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This is a great example of how aviation and marine applications differ. Aircraft have bronze bushings in aluminum from stem to stern.
The bushings and bearings at the local Ace are not brass.
Galvanic reactions take two dissimilar metals and an electrolyte.

In aviation, unless you fly a Mallard or something on floats, you generally don't soak an airplane in an electrolyte IE salt water.

Would like to know more about what exactly Ace sells in real bronze alloys. I'm overhauling a boat and from where I'm located it's about 2 hours to the nearest chandlery. Not even a West Marine within 80 miles so a local source for anything suitable would be very interesting.

So can you tell me what kind of bushings exactly Ace sells in bronze and what bronze alloy do they use? Anything else like bronze bolts, screws other hardware?
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Old 11-11-2014, 10:44   #17
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

ACE: I believe they are sintered bronze.. which hold lube better than a plain bronze bushing...
OP: If you cant find the flared nylon bushings, just get a nylon bushing and use a thick nylon washer on the top.
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Old 11-11-2014, 10:48   #18
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

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flanged nylon bushings. Should be readily available.
This is the answer. All the talk about custom machining and delrin and G10 is nuts. Simpson Lawrence did not source them this way - they just bought a box of inexpensive flanged nylon bushings from their local supplier.

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Old 11-11-2014, 10:54   #19
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

at Lowes, 1/2" OD x 3/8 ID, nylon. $.70 each: (use a good SS washer on top)
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Old 11-11-2014, 11:26   #20
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

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ACE: I believe they are sintered bronze.. which hold lube better than a plain bronze bushing.
Sintered bronze, which by the way is the same process they use to make those ground plates that blow up when lightning exits one. So instead of holding oil they hold water.
Just brass screws at Ace I think.
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Old 11-11-2014, 12:07   #21
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

Thanks everyone, as usual y'all got the answers.
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Old 11-11-2014, 19:46   #22
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Re: Carriage Bolt sleeve(?) for dissimilar metals(??)

Here's the parts diagram for the SL Sea Tiger 555 windlass.....

http://www.lewmar.com/%5Cassets%5Cim...er-D1031-1.pdf

They call them 'headed bush'. I would have called them Delrin insulators. Delrin is a trade name for a nylon.

Lewmar took over Simpson-Lawrence. The Lowes part looks very good and if they don't work out, phone Lewmar and ask after them.

A few years ago somebody in the UK started building these windlasses again, so if Lewmar doesn't have parts they may be able to put you onto someone who does.
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