Hex. Head Bolt And Nut, M12 X 50 Mm, Product Grade 'C', M.S., Black. Matl.& Specn : Is: 1363 (Part - 1) / 2023 (6Th Rev.) And Is: 1363 (Part - 3) / 2018 (5Th. Rev.) , Property Class 4.6 For Bolt An D Property Class 5 For Nut. [ Warranty Period: 30 Months After The Date Of Delivery ] ]