Hex Head Bolt And Nut, M 12 X 25 Mm. Product Grade 'C', M.S., Black Matl. & Spec. Is:1 363 (Part - 1)/2023 (6Th Rev.) And Is: 1363 (Part- 3) / 2018 (5Th. Rev.), Property Class 4.6 For Bolt And Property Class 5 For Nut. [ Warranty Period: 30 Months After The Date Of Delivery ] ]