ss316 flange hex bolts DIN6921 material:stainless steel... grade:4.8/8. ... /10.9/12.9 ... finish:zp,hdg,plain,black.. SS316 flange hex bolts DIN6921 1.Materials: Stainless Steel,Carbon Steel,ETC ... "-3/4" 3.Length: 6-300mm 4. Grade of Hex Flange Bolt: From grade4.6 to 12.9, Grade2-Grade10. 5 ... , yellow zinc plated, black zinc plated, HDG and dacromet SS316 flange hex bolts DIN6921