IS 1363-1 INDIAN STANDARD HEXAGON HEAD BOLTS, SCREWS AND NUTS OF PRODUCT GRADE ‘C’ PART 1 HEXAGON HEAD BOLTS (SIZE RANGE M 5 TO M 64) IS 1363 Part 1: 2002 / ISO 4016 Steel : 4.6, 4.8, 8.8, 10.9Finish: Self, Zinc Plated, Hot Dip Galvanized