Type 303 is a non-magnetic stainless steel, which is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium - 8% nickel stainless steel.

303 has good resistance to oxidation at temperatures up to 1700°F.  In extreme oxidizing atmospheres, irregular scaling may be encountered, particularly above 1400°F.

Also available in PRODEC® enhanced machining grade.


303 Flat Bar, 303 PRODEC® Hex Bar, 303 PRODEC® Round Bar, 303 Square Bar

Common Trade Names

303 Stainless


  • Melted and processed to maximize machinability
  • Improved machinability over 304/304L and 316/316L


  • Automatic screw machines
  • Conveyor systems