IS 1363-3 INDIAN STANDARD HEXAGON HEAD BOLTS, SCREWS AND NUTS OF PRODUCT GRADE ‘C’ PART 3 HEXAGON HEAD NUTS (SIZE RANGE M 5 TO M 64) IS 1363 Part 3: 2002 / ISO 4034 Steel : 4, 8, 10Finish: Self, Zinc Plated, Hot Dip Galvanized