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Old 24-06-2010, 22:53   #1
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Where to Find Bronze Flat Bar for Chainplates ?

I want to replace my chainplates with bronze, but I can only find stainless flat bar. I can find round silicon bronze though, would that work for a chainplate?
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Old 24-06-2010, 23:15   #2
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Old 24-06-2010, 23:32   #3
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Is bronze the right metal for chainplates?

*not that I know, of course!*
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Old 24-06-2010, 23:42   #4
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Is bronze the right metal for chainplates?

*not that I know, of course!*
Whatca think? What's good for propellers should be good for chainplates.

Maganese - Nickel Aluminum Bronze (Aqualloy) vs. Stainless Steel in Marine Propellers
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Old 25-06-2010, 00:25   #5
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I'm not familiar with aqualloy, but regular bronze is too soft and weak to use for chainplates. I think even thick aluminum or galvanized steel would be better if you're looking to save money. I'm biting the bullet and using stainless to replace mine. Chainplates are about the last thing I want failing on my boat.
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Old 25-06-2010, 00:59   #6
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Old 25-06-2010, 05:59   #7
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Second the recommendation for Onlinemetals.com. Just replaced my chainplates and ordered from them. Good service and shipping from WA to FL was not bad at all.

If you decide on bronze I did not see bar stock in their catalog. Guess you could get 1.5" rod and machine it down flat. I just used 316 stainless.
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Old 25-06-2010, 06:12   #8
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"Aqualoy"* is a Stainless Alloy shafting material.
http://www.gpcprop.com/catalog%20pdf...20Shafting.pdf

* "Aqualoy" is a registered trade name of Western Branch Metals, Inc.

See also ➥ Order Stainless Rectangle Alloys 303, 304, 316, 410, 420, 440C in Small Quantities at OnlineMetals.com
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Old 25-06-2010, 06:43   #9
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I've ordered bar stock from McMaster-Carr online before. I ordered 316 stainless for my chainplates, but they have a large selection so they may have bronze. Shipping was fast, but they seemed a little pricey.

As far as bronze for chainplates, I don't know either way. But my turnbuckles are bronze so maybe it's good for chainplates.
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Old 25-06-2010, 06:55   #10
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Don't use bronze! These chainplates are almost 60yrs old and will give way any second now.

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Old 25-06-2010, 09:17   #11
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I stand corrected. There are bronze alloys which are very suitable for chainplates.
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Old 25-06-2010, 09:33   #12
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That's all they had before stainless came on the scene other than iron, or galvi. steel
most wooden boats of yesterday had silicon bronze chain plates. we had hull # 1345 lightning built in 1945 all hardware was cast silicon/naval bronze and the chain plates were flat bar bronze!!!!!! i mean really if they make turn buckles out of the stuff would you think it would suffice for chain plates. it is actually better than stainless because with bronze bolts you don't get electrolysis only a green patina, that can discolor your hull. you can get it but it is a lot more expensive than s.s., that's why i opted for s.s. drilled, ,rounded tops, bent, and polished them my self at home. all my chain plates are 3/8" by 2" 304 s.s. 304 is easier to drill than 316 and is what was orig. equip on boat from factory. i went over size because we are heading off shore and wanted the extra security
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Old 25-06-2010, 10:43   #13
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Thanks for all the info! I realize the bronze alloy matters, but there are a number of suitable ones.

I like bronze because it won't fatigue, and will therefore last longer than stainless. The problem is where to get it.

In any case, stainless is probably strong enough, and I can always increase the thickness to make them last longer.

Then again, there is the possibility of carbon fiber.
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Old 25-06-2010, 10:53   #14
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Then again, there is the possibility of carbon fiber.
Yeah, but you'd have to paint the carbon fiber to protect against UV. A better idea would be to go with teak chainplates which you'd only have to varnish every spring.
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Old 25-06-2010, 10:55   #15
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gecko i just googled bronze flat bar there is a web page from wooden boat forum with same question more or less and the quote was from McMaster for $88. for a 1/4 by2" by6' this was a 2006 quote for aluminum-bronze good luck
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