Good coating for fine pitch threads on 300 series s.s.?

[ScottAW]

I have a series of concentric sleeves that pilot onto one another via their OD surfaces, and then engage with a fine pitch thread. I'd like to coat the entire part, with emphasis on coating the threads to prevent gallling and also providing a hard, low friction surface for the pilot surfaces.

So far I've thought about titanium nitride or just electrolyzing the parts, any other suggestions? The threads are 1-1/2" to 2" in diameter, with 40 threads per inch. (odd size, I know, but I need that pitch)

Thanks!

 

[JTreglio]

What are the parts made from?

Jim Treglio
Molecular Metallurgy, Inc.

 

[ScottAW]

Whoops - sorry, should have mentioned that. I plan on using 300 series S.S., probably 303.

 

[JTreglio]

PVD titanium nitride should work -- we coat 300 series stainless quite often. There are some PVD solid lubricant coatings on the market that would give you very low friction coefficients. These are generally more expensive.

Jim Treglio
Molecular Metallurgy, Inc.