Schedule 40 Stainless Steel TOE Nipples • Max. pressure: 150 psi WOG at 150°F Temp. range: -60° to 450°FNPT threads on 1 end for easy connection; other end is nonthreaded for welding or brazing. For use with Class 150 stainless steel threaded pipe fittings for applications with air, water, oil, natural gas, and steam. Meet ASTM A733. 304 stainless steel is a chromium-nickel material that offers very good corrosion resistance. 316 stainless steel has a higher nickel content, with the addition of molybdenum for better corrosion resistance.