BUREAU OF INDIAN STA INDIAN STANDARD ISO METRIC TRAPEZOIDAL SCREW THREADS : PART 2 PITCH DIAMETER COMBINATIONS. IS 7008 ( - 1st rev. ed. 1988 - NEW DELHI BUREAU OF INDIAN STANDARDS. - 9 Subjects--Topical Terms: ISO METRIC TRAPEZOIDAL SCREW THREADS Dewey Class. No.: 621 / BUR