HANDBOOK H-28 - PART II - SCREW-THREAD STANDARDS FOR FEDERAL SERVICES 1957 [REPRINTED NOVEMBER 1960 WITH CORRECTIONS] [S/S BY FED-STD-H28/ SERIES]

HANDBOOK H-28 - PART II - SCREW-THREAD STANDARDS FOR FEDERAL SERVICES 1957 [REPRINTED NOVEMBER 1960 WITH CORRECTIONS] [S/S BY FED-STD-H28/ SERIES]., The Interdepartmental Screw Thread Committee has been established by the Departments of Defense, Army, Navy, Air Force, and Commerce to promote uniformity in screw-thread standards in the Departments concerned. The Committee is charged: (1) With the development of standards for screw threads; (2) the standardization of gages, dies, and taps; and (3) the standardization of dimensions of nuts, bolt heads, wrenches, and other items associated with the manufac- ture and use of interchangeable threaded parts. Standards developed by the Com- mittee, when approved by the Departments concerned, are to be published together with a joint order making their use mandatory in the Departments of Defense and Commerce, except where, a need for deviations therefrom is shown. Standards thus established are subject to such extension and revision as the Committee may find desirable. The basis for this Handbook is the 1933 report, and preceding reports, of the National Screw Thread Commission, and Handbooks H25 dated 1939, and H28 dated 1942 and 1944, which superseded those reports and which this Handbook supersedes, together with pertinent standards approved and promulgated by the American Stand- ards Association. The current Handbook is to be issued in three volumes or parts, of which this volume constitutes Part I, superseding sections I, II, III, IV, V, XV, and XVI and appendixes 1, 2, 6, and 8 of Handbook H28 (1944). XVII and appendix 7 of H28 (1944) are superseded by Federal Specifications listed in appendix 6 herein. Part II will include standards for hose-coupling, pipe, and gas cylinder threads, and will be issued when the revised standards have been completely formulated. This will be followed by Part III, to include Acme, Stub-Acme, Buttress, and miscellaneous standard threads. The standardization of bolts, nuts, screws, and related items, for purposes of procurement by the Federal Government, is covered by several pertinent Federal Specifications which are listed in the Index of Federal Specifications and Standards, available on a subscription basis from the Superintendent of Documents.