304, 316
Stainless steel fittings for medical devices are used in a very special environment, the hospital disinfectant corrodes metal products very much, so there are certain standards in the selection of materials.
The general use of 18% chromium + 8% nickel (304), 18% chromium + 10% nickel (316) stainless steel can ensure that the instruments are more corrosion-resistant, stronger and longer service life.