... Carbon steel.3. Grade of hex nut: Grade 4.8, Grade6.8, Grade8.8, Grade10.9, Grade12.9. Inch standard: Grade2, Grade5 ... 1/2''Material:Carbon steel, Q195, 35KNut Grade:Class4.8, 6.8, 8.8, 10.8and12.9; inch grade:gr2 and gr5Surface treatment:Plain, ... , HDG, blackStandard:DIN934, ISO4032, ANSIHead mark:S |8|, S 8, S 10 and according to customer's requirementCertification:ISO9001:2008 SIZESTANDARDACROSS ...