ASME Y14.5M:09 pdf download.Dimensioning and Tolerancing-Engineering Drawing and Related Documentation Practices.
ASME Y14.5M establishes uniform practices for stating and interpreting dimensioning, tolerancing, and related requirements for use on engineering drawings and in related documents. For a mathematical explanation of many of the principles in this Standard, see ASME Y14.5.1. Practices unique to architectural and civil engineering and welding symbology are not included.
1.1.1 General
Section 1 establishes definitions, fundamental rules, and practices for general dimensioning. For tolerancing practices, see Sections 2 through 9. Additional information about tolerancing maybe found in Nonmandatory Appendices A through E.
1.1.2 Units
The International System of Units (SI) is featured in this Standard because SI units are expected to supersede United States (U.S.) customary units specified on engineering drawings. Customary units could equally well have been used without prejudice to the principles established.
1.1.3 Reference to This Standard
Where drawings are based on this Standard, this fact shall be noted on the drawings or in a document referenced on the drawings. References to this Standard shall state ASME Y14.5-2009.
1.1.4 Figures
The figures in this Standard are intended only as illustrations to aid the user in understanding the principles and methods of dimensioning and tolerancing described in the text. The absence of a figure illustrating the desired application is neither reason to assume inapplicability, nor basis for drawing rejection. In some instances, figures show added detail for emphasis. In other instances, figures are incomplete by intent. Numerical values of dimensions and tolerances are illustrative only. Multiview drawings contained within figures are third angle projection.
NOTE: To assist the users of this Standard, a listing of the paragraph(s) that refer to an illustration appears in the lower right- hand corner of each figure. This listing may not be all-inclusive. The absence of a listing is not a reason to assume inapplicability. Some illustrations may diverge from Y14 drawing practices to clarify the meanings of principles.
1.1.5 Notes
Notes herein in capital letters are intended to appear on finished drawings. Notes in lowercase letters are explanatory only and are not intended to appear on drawings.
1.1.6 Reference to Gaging
This document is not intended as a gaging standard. Any reference to gaging is included for explanatory purposes only. For gaging principles see ASME Y14.43 Dimensioning and Tolerancing Principles for Gages and Fixtures.
1.1.7 Symbols
Adoption of symbols indicating dimensional requirements, as shown in Fig. C-2 of Nonmandatory Appendix C, does not preclude the use of equivalent terms or abbreviations where symbology is considered inappropriate.
1.2 REFERENCES
The following revisions of American National Standards form a part of this Standard to the extent specified herein. A more recent revision may be used provided there is no conflict with the text of this Standard. In the event of a conflict between the text of this Standard and the references cited herein, the text of this Standard shall take precedence.ASME Y14.5M pdf download.