Manganese bronze bolts

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Does anyone know where I can buy a pair of 1/2" x 4" (or thereabouts) bolts with nuts and washers in manganese bronze? I need a pair to hold my sterntube in (well the boat's actually). I'm guessing that's what the originals were made of. Any thoughts / advice out there?
 
You might try the old Foulkes barge at Bursledon bridge(thats the other side of the A27 from Alladins but on the same bank of the Hamble about 1/4 mile up river). They keep a range of metric/imperial fasteners and it's pot luck.
 
Try Anglia Stainless Limited

Tel 01359 251414 and 251417 If you want their address then ask in this section best wishes Ray
 
Manganese bronze is (almost) brass

it contains zinc and corrodes underwater leaving a weak spongy copper. What you need is Silicon and/or Aluminium bronze
 
Thanks all of you.

Funnily enough, that's exactly what's happened to mine! They've turned into a powdery copper mess. Will Silicon or Aliminuim bronze be OK in electrical contact with the sterntube (Which I assume is brass)? This, in turn, is probably in electrical contact with the stainless shaft (via the two bearings).
 
which I hope are incontact with a shaft brush wired up to the anode.

David
 
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