Stainless or mild for bush inserts

[Paulbarrett]

i need to make some inserts for some poly bushes on a car subframe,

My advice on stainless grade to use or just mild steel?

 

[grim_d]

I suspect you would need to use an austenitic stainless to avoid galvanic corrosion?

 

[Paulbarrett]

So 304 would do?
Easy enough to turn?

 

[Paul.]

304 will machine ok, although if you are not intending to weld it then 303 is a material specially made for machining, its available in most diameters of bar stock.
Cant you use a standard tube size?.

 

[Paulbarrett]

Thanks paul
possibly, but have a lathe and tooling, good excuse to use it!

 

[tinman123]

the stainless id that bit harder and maybe there is need for that but id say f it was a manufacturer they would just make it out of MS.
i take it your painting it anyways and have the space to beef up the ms a bit to be sure to be sure.

 

[Paulbarrett]

it's for wishbone bushes and subframe, so I guess stainless will give the best corrosion resistance, the original ones that were in the rubber bushes have suffered with rust, despite being plated, but also give too much play in the new polyurethane bushes

 

[langy]

Poly bush tubes are usually cad plated steel, the poly grease stops them rusting

 

[Paulbarrett]

Turned stainless a better option, basically the bushes I have sourced from Germany do not come with the tubes,

 

[tinman123]

if you have the material then why not then so.
its the better steel altho it id be no harm if the link rod was stainless too.
might as well get hung for a sheep as a lamb ho.

 

[Mr shiney]

I replace all the bushes on my bike projects with stainless.