BUREAU OF INDIAN STA INDIAN STANDARD BOLTS, SCREWS AND NUTS OF PRODUCT GADE C : PART 2 HEXAGON HEAD BOLTS (SIZE RANGE M 5 - 4th ed. 2002 - NEW DELHI BUREAU OF INDIAN STANDARDS. - 11 Subjects--Topical Terms: HEXAGON HEAD BOLTS Dewey Class. No.: 621 / BUR