Stainless steel screw nut manufacturer / supplier in China, offering DIN 6331 Hex Nut with Collar, M16 Flange Hex Nuts 2 Pack Grade 8.8 Carbon Steel Black Oxide Finished Hex Flange Nuts for Machinery, DIN6331 M7 Carbon Steel Black Oxide High Strength Flange Nut with Heat Treatment and Flange Shape and so on.