1950 Supplement to Screw-Thread Standards for Federal Services 1944
U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS 1950 SUPPLEMENT TO SCREW-THREAD STANDARDS FOR FEDERAL SERVICES 1944 1950 Supplement to Handbook H28 (1944) National Bureau of Standards DEC 1 6 1952 78441 QC1 Related Publications .... U51 cop, 2. Screw-Thread Standards for Federal Services, 1944 Screw-thread standards for the Federal Government have been estab¬ lished by the Interdepartmental Screw-Thread Committee of the Army, Navy, Air Force, and Commerce Departments in order to insure the interchangeability of threaded parts. Bolts, nuts, gages, dies, taps, wrenches, and all other items associated with the manufacture of threaded parts have been listed, and definitions of sizes, tolerances, and shapes are fully illustrated by means of drawings and tables. Order NBS Handbook 28 (1944), Screw-Thread Standards for Federal Services, 1944, 274 double-column pages, from the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C. Price ?1.00. Unified Screw-Thread Standards An accord for unification of American, British, and Canadian standard systems of screw threads was signed at the National Bureau of Stand¬ ards on November 18, 1948. This circular gives the proceedings of the meeting, together with detailed illustrations, tables, and numerical data setting forth standards of thread form. In the past, international trade in mechanical equipment of all kinds has been seriously handicapped by the lack of interchangeability of screw-thread parts. The adoption of these unified screw-thread stand¬ ards will remove an important barrier to the exchange of manufactured goods throughout the world. Order NBS Circular 479, Unified Screw-Thread Standards, 27 large pages, illustrated, from the Superintendent of Documents, U.
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