... Material: carbon steel, alloy steel, stainless steel, etc. Production InformationHex flange boltStandard: IFI-111,DIN6921Size: 1/4”-1”, M5-M20Material: Carbon ... Steel, Stainless SteelGrade: SAE J429 Gr.2, 5,8; ASTM A307 Gr.A,CL4.8, 5.8, 6.8, 8.8, 10 ... and steel certificate and inspection report can be provided! Hex flange Bolts