Pearson 424 tang bolt

[Brion Toss]

Hi again,
If it's good bronze, and actual bronze (not brasses like manganese bronze or naval bronze), and if the scantlings are right, bronze is great.
Fair leads,
Brion Toss

[Petedd]

Thanks Brion

[Petedd]

The readily available bronze bushings are scinterd bronze:

86.3-90.5% copper
9.5-10.5% tin
1.0% iron
0% lead
1.7% carbon

No zinc which I think is a good thing for strength. But that one percent iron would seem to be problematic in the marine environment.

Also, SAE 660 bronze:

83% copper
7% tin
7% lead
3% zinc

for which it is said: The alloy is not subject to dezincification and has reasonable corrosion resistance to seawater and brine making it suitable for pump and valve components.

Thoughts?

[Brion Toss]

Hi again,
As I understand it, if it has zinc in it, it is brass. So let's eliminate that one. Iron isn't necessarily an obstacle; some of the strongest, most corrosion-proof bronzes contain iron (and other metals that you might think would be a problem), but through the magic of alloying all is well.
It looks like your other choice is a variant on something called "tin bronze", which is actually, you guessed it, a brass, even though it has no zinc. I don't know anything about how it might behave when turned into a bushing ...
Fair leads,
Brion Toss