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ASME B4.2
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ASME B4.2 1978 Edition, January 1, 1978 Preferred Metric Limits and Fits
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Description / Abstract:
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.
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.