Hex. Head Bolt & Nuts M 12 X 45 Mm Of Product Grade 'C' M.S. Black Is: 1363 (P Art-I) 2002 (4Th Rev.) And Is:1363 (Part - 3) 1992 (3Rd Rev.) Property Class 4.6 For Bolt And Property Class 4.0 For Nut. [ Warranty Period: 30 Months After The Date Of Delivery ] ]