ASME B4.2 1978 RA2020
$98.04
ASME B4.2 – 1978(R2020) Preferred Metric Limits and Fits
| Published By | Publication Date | Number of Pages |
| ASME | 1978 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 9 | CONTENTS FIGURE TABLE APPENDIX |
| 11 | SECTION 1 Scope 2 Definitions 1 Illustration of Definitions |
| 12 | 3 Description of Tolerance Designation 4 Symbols 5 Preferred Basic Sizes |
| 13 | 6 Preferred Tolerance Zones 7 Preferred Fits 1 Preferred Sizes |
| 14 | 2 Tolerance Zones for Internal Dimensions (Holes) 3 Tolerance Zones for External Dimensions (Shafts) |
| 15 | 4 Preferred Hole Basis Fits |
| 16 | 5 Preferred Shaft Basis Fits |
| 17 | 6 Description of Preferred Fits |
| 18 | 2 Prefcrred Hole Basis Clearance Fits |
| 20 | 3 Prefcrred Hole Basis Transition and Interference Fits |
| 22 | 4 Preferred Shaft Basis Clearance Fits |
| 24 | 5 Preferred Shaft Basis Transition and Interference Fits |
| 26 | A Tables of Deviation from Basic Sizes Up to 500 mm of Preferred Tolerance Zones |
| 51 | B Tables of International Tolerance Grades, Fundamental Deviatlons and Their Derivations |
| 72 | C Applications |
| 74 | D ReferenceTemperature |
