Manufactured to the most stringent quality standards � TS16949 approved manufacturing Available in a range of materials: EN-1A steel, 303 Stainless Steel, Brass etc. Fitting profile & dimensions are accurately controlled & conform to SAE, DIN, BS, JIS & IS standards Grease fittings are heat treated to SAE J534 specification with hardness on greasing end to a minimum of 83 on Rockwell 15N scale with a case depth of 0.005� (0.13 mm) to 0.009� (0.23 mm) Fittings with ball check use heat treated springs for increased life.