stainless steel flange nuts 1)Standard: ISO, DIN,ANSI, BS, JIS, UNI 2)Size: M4-M20 3)Material: stainless steel 200,304,316 stainless steel flange nutsFeatures: 1)Standard: ISO, DIN,ANSI, BS, JIS, UNI 2)Size: M4-M20 3)Material: stainless steel 200,304,3164)grade:A2,A4