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[Cadser]

Are prop shafts stainless steel. The shaft part which rotates. 

Bri

[HMS Invisible]

Look up hardening & austenitic properties of BS1407 silver steel, "304" & "316" stainless so you can do a bit of due diligence to check if the bloke at the back of the room shouting out an answer knows anything at all. Don't be shy of asking a supplier of stern tube, shaft & bearing what they actually supply.
 I made my own out of 5/32 silver steel. Every commercial shaft I've bought was silver steel.

[Circlip]

For smaller diameters, check with welders for St.St. welding rods and if going down the 304/316 route, make sure to get the 'L' grades (304L or 316L) which are the low Carbon versions. Some grades of Stainless DO rust.


 Regards Ian

[SteamboatPhil]

They really don't need to be SS, normal still steel will do, as an example, (and don't forget care and well oiled will last) so back to my experince, standard steel will last, my Grandfathers high speed steam boat, built in 1942, still perfect, my fathers boat built in 1959....yes still going, my high speed steam boat (built 1982) steel shaft....yes still perfect
So with oil and care


Just my opinion 

[Circlip]

Wonder if yer Gramps had easy access to Stainless back then he would have rejected it Phil? One major difference nowadays is the amounts of shaft exposed to H2O. Back in the fifties and no doubt earlier, ALL prop shafts had full length tubes wrapped round them, didn't need a locknut on the prop and had a propper drive coupling that allowed for shaft endfloat of both the drive source AND the driven. How we have 'Progressed'


   Regards  Ian.


  And Yes, they were ALL Carbon Steel.