Hexagonal Head Bolts And Nut Size: 12 Mm X 50 Mm Length, Property Class Of Bol T Is 4.6 As Per Is: 1363 (Part-I)/2002, Property Class Of Nut Is 5 As Per Is: 1363 (Part-3)-2002. [ Wa Rranty Period: 30 Months After The Date Of Delivery ] ]