... Material: carbon steel, alloy steel, stainless steel, etc. Production InformationHex flange boltStandard: IFI-111,DIN6921Size: 1/4”-1”, M5-M20Material: Carbon ... /Yellow/Black), Black oxide, Nickel, Chrome, H.D.GApplication: Auto mobile Industry, Mechanical equipment Industry Our Advantages: Trade term:Ex-work ... and steel certificate and inspection report can be provided! Hex flange Bolts