Content Description
This standard describes the ISO system of limits and fits for mating parts as it is approved for general engineering usage in the United States of America. It establishes: (1 the designation symbols used to define specific dimensional limits on drawings, material stock, related tools, gages, etc., (2 the preferred basic sizes (first and second choices, (3 the preferred tolerance zones (first, second and third choices, (4 the preferred limits and fits for sizes (first choice only up to and including 500 millimeters, and (5 definitions of related terms. Tolerance zones for basic sizes in the range from 500 to 3150 mm are specified in Appendix B. The general terms "hole" and "shaft" can also be taken as referring to the space containing or contained by two parallel faces of any part, such as the width of a slot, the thickness of a key, etc.
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About ASME
ASME is a not-for-profit membership organization that enables collaboration, knowledge sharing, career enrichment, and skills development across all engineering disciplines, toward a goal of helping the global engineering community develop solutions to benefit lives and livelihoods. Founded in 1880 by a small group of leading industrialists, ASME has grown through the decades to include more than 130,000 members in 158 countries. Thirty-thousand of these members are students.
From college students and early-career engineers to project managers, corporate executives, researchers and academic leaders, ASME's members are as diverse as the engineering community itself. ASME serves this wide-ranging technical community through quality programs in continuing education, training and professional development, codes and standards, research, conferences and publications, government relations and other forms of outreach.