Thread: Threading Stainless

Should be OK if you use type 303, it will cut like mild steel and not workharden.
I'm not familiar with other types.
Neil

Neil, Would 303 be your most common type or special order?

I recently used a cheap Chinese die to cut a 3/8 NPT thread on some 316 stainless. I was surprised at the result. The thread was nice, clean and well formed. I used Trefolex and backed off after each half turn.

From memory the die was carbon steel, not even HSS.

Cheers,

Simon

If you want a reasonable (ie more than say25-50mm) length of thread, there's no way I'd cut it with a die. I'd go and buy a length of 316 allthread in the pitch I needed and weld, thread or otherwise butcher the gripping end to suit the task at hand.

Some things simply are not worth doing.....

PDW

Certainly use Trefolex.

Michael

Depending on what I'm doing, sometimes I will single point a thread to 90% and finish off with a die.

Originally Posted by Michael G

Certainly use Trefolex.

Michael

Which one? Oil, Paste?

Paste

M.

“……common type or special order? “
We bought a couple of lengths from a supplier in Dandenong, off the shelf not special order. Can’t remember the supplier name, but I see 303 on a few local websites.

FWIW, Metal Machinability comparison: http://www.engineeringtoolbox.com/ma...ls-d_1450.html