Circular of the Bureau of Standards, Masalah 479U.S. Government Printing Office, 1948 |
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1A and 1B 3A and 3B agreement Allowances and tolerances American Standards Association Basic Major Diameter Britain British Standards Institution Bureau of Standards Canada Canadian Standards Association Charles Sawyer classes 1A coarse thread series Condon controlled by gages cooperation Designation External thread Diameter of External Donald Carpenter engagement equal engineering industry committee External thread limiting External Thread Minimum Form of Thread inch Thread symbol Inches Inch Inches Interdepartmental Screw Thread James Forrestal length of engagement Limits of size Major diameter Tolerance Max Min Max Maximum Major Diameter Maximum Pitch Diameter Minimum Minor Diameter Ministry of Supply National Bureau PD Tolerance practice represented Screw Thread Committee Screw Thread Standards Secretary Sectional Committee Sir Ewart Smith Sponsors Council standards for screw step table thds thread limiting dimensions threaded products threading tools tion Tisch UNF 1B Unification of Screw Unified classes 3A Unified coarse thread Unified form Unified Screw Thread United Kingdom
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Halaman 15 - series is recommended for general use in engineering work, in machine construction where conditions are favorable to the use of bolts, screws, and other threaded components where quick and easy assembly of the parts is desired, and for all work where conditions do not require the use of fine-pitch threads.
Halaman 11 - program of research to be carried out by the National Bureau of Standards of the United States, the National Physical Laboratory of England, and the National Research Council of Canada. The present accord calls for a continuance of future cooperation in the field of screw-thread standardization. Such cooperation has two aspects: first,
Halaman 10 - for the unified screw threads given in the publications of the committees of the British Standards Institution, Canadian Standards Association, American Standards Association and of the Interdepartmental Screw Thread Committee fulfill all of the basic requirements for general interchangeability of threaded products made in accordance with any of these standards.
Halaman v - organized under the procedure of the American Standards Association and sponsored by The American Society of Mechanical Engineers and the Society of Automotive Engineers
Halaman 11 - screw-thread research is important. A screw thread is one of the more complex regular geometrical forms. There are so many variables which enter into the design of a satisfactory threaded fastener that most of the knowledge applied in such design is empirical rather than theoretical. An immediate result of the Ottawa conference in 1945 was the establishment of a program of research to be
Halaman 11 - of threaded products made in accordance with any of these standards. The bodies noted above will maintain continuous cooperation in the further development and extension of these standards. Signed in Washington,
Halaman v - CONDON, Director of the National Bureau of Standards and Chairman of the Interdepartmental Screw Thread Committee of the United States of America
Halaman 17 - is intended to cover the manufacture of threaded parts where quick and easy assembly is necessary, and where an allowance is
Halaman 15 - of the thread, measured in an axial plane, is 60°. The line bisecting this 60° angle is perpendicular to the axis of the screw thread. 2.
Halaman 15 - series is recommended for general use in automotive and aircraft work, and where special conditions require a fine thread.