What kind of bronze for keel shoe & bolts

Toolate

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Keelboater

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You should use a high silicon bronze with little or no zinc. The unified numbering system spec is C65500. This type of bronze holds up the best in marine applications. Your reference to the old school SAE numbering system may or may not be correct. I have found that most companies are using the unified system. Zinc in the bronze can become subject to a dezincafication process, a form of corrosion, which is why you want to avoid it. Phosphor bronze or aluminum bronze would be my second choice. Here is a link to just one of many distributors. Atlas Metal Sales
 
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Leprechaun

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Not sure if they will have this type of bolt but I just rebuilt a trailer and used BOLTDEPOT.COM (Weymouth Ma.)
 

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Robo

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Bronze fastners

Jamestown Distributers, they are in Bristol R.I. has a good selection of silicon bronze hardware. Web site and catalog sales too

Robo
 

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Robo

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Jamestown Distributers

I too have a 30 ft Sisu. I changed the cutlass about 10 yrs ago. Came out easy. I replaced the set screws and locknuts with silicon bronze from Jamestown. They are still like the day I put them in. To my knowledge, they carry good stuff. Call them and talk. Their store in Bristol has a lot on the shelf if you want to see it first hand

Robo
 

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Toolate

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Toolate

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1 1/2" high x 4" wide, and the web is 1/2" thick? How long is it? A lot of those odds and ends were custom cast for the builders. I like the plate idea. But if you need the channel for obtaining a good fit, you can always machine one from a piece of bar stock. Maybe Buck Algonquin might have the cast c channel? As a wise man once said "show us a picture!" ;) (Who could that be?)
 

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bronze shoe

If you can't find a direct replacement. I could make a wood pattern with the modifications that you are suggesting and have it cast at a local foundry in manganese bronze.
 

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Bronze casting

The cost for a new wood pattern is $ 150-200. It is difficult to estimate the cost of the casting as the foundry bases their prices on the weight, as well as the size of the flask that is required for the sand mold. I would need a dimensional drawing or the existing shoe to show the foundry. I wish I could give you a firm cost but for " one off castings" this is how the process works.
 

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