Product name:Hex Flange Nut;Material:Stainless Steel/Others;Garade:A2-40,A2-70,A2-80,A4-70,A4-80,304,316,etc.;Certificate:IECEE/TUV/ISO9001/ISO14001/OHSAS18001;Surface treatment:HDG/Plain/Black/Dacromet/etc;Thread Type:M/UNC/UNF;Size:M3-M72(3/16''- 4'')/