BUREAU OF INDIAN STA INDIAN STANDARD ISO METRIC TRAPEZOIDAL SCREW THREADS : PART 4 TOLERANCES. IS 7008 (PART 4) 1999 - 2nd rev ed. 1999 - NEW DELHI BUREAU OF INDIAN STANDARDS. - 12 Subjects--Topical Terms: ISO METRIC TRAPEZOIDAL SCREW THREADS Dewey Class. No.: 621 / BUR