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ASME Y14.5-2018 Dimensioning and Tolerancing.pdf
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Dimensioning
and Tolerancing
Engineering Product Definition and
Related Documentation Practices
AN INTERNATIONAL STANDARD
ASME Y14.5-2018
(Revision of ASME Y14.5-2009)
ASME Y14.5
ADOPTION NOTICE
ASME Y14.5, Dimensioning and Tolerancing, was adopted on 9 February 2009 for use by the
Department of Defense (DoD). Proposed changes by DoD activities must be submitted to the DoD
Adopting Activity: Commander, U.S. Army Research, Development and Engineering Center
(ARDEC), ATTN: AMSRD-AAR-QES-E, Picatinny Arsenal, NJ 07806-
5000. Copies of this
document may be purchased from The American Society of Mechanical Engineers (ASME), 150
Clove Road, 6th Floor, Little Falls, NJ 07424-2139; http://www.asme.org.
Custodians:
Army — AR
Navy — SA
Air Force — 16
Adopting Activity:
Army — AR
(Project DRPR-2009-003)
Review Activities:
Army — CR, MI, PT, TM
Navy — AS, CG, CH, EC, MC, NP, TD
Air Force — 13, 99
DLA — DH
OSD — SE
NSA — NS
Other — CM, MP, DC2
NOTE: The activities listed above were interested in this document as of the date of this document.
Since organizations and responsibilities can change, you should verify the currency of the
information above using the ASSIST Online database at https://quicksearch.dla.mil.
ASMC N\A
AREA DRPR
DISTRIBUTION STATEMENT A. Approved for public release, distribution is unlimited.
ASME Y14.5-2018
(Revision of ASME Y14.5-2009)
Dimensioning and
Tolerancing
Engineering Product Definition and
Related Documentation Practices
AN INTERNATIONAL STANDARD
x
Date of Issuance: February 11, 2019
This Standard will be revised when the Society approves the issuance of a new edition.
Periodically certain actions of the ASME Y14 Committee may be published as Cases. Cases are published on the ASME website
under the Y14 Committee Page at http://go.asme.org/Y14committee as they are issued.
Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections to
incorrectly published items, or to correct typographical or grammatical errors in codes and standards. Such errata shall be used
on the date posted.
The Y14 Committee Page can be found at http://go.asme.org/Y14committee. There is an option available to automatically
receive an e-mail notification when errata are posted to a particular code or standard. This option can be found on the
appropriate Committee Page after selecting “Errata” in the “Publication Information” section.
ASME is the registered trademark of The American Society of Mechanical Engineers.
This international code or standard was developed under procedures accredited as meeting the criteria for American National Standards
and it is an American National Standard. The Standards Committee that approved the code or standard was balanced to assure that individuals
from competent and concerned interestshavehad an opportunity to participate. The proposed code or standard was made available for public
review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-
large.
ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.
ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this
document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor
assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the
risk of infringement of such rights, is entirely their own responsibility.
Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry
endorsement of this code or standard.
ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures
and policies, which precludes the issuance of interpretations by individuals.
No part of this document may be reproduced in any form,
in an electronic retrieval system or otherwise,
without the prior written permission of the publisher.
The American Society of Mechanical Engineers
Two Park Avenue, New York, NY 10016-5990
Copyright © 2019 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved
Printed in U.S.A.
CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Correspondence With the Y14 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Section 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Reference to This Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.4 ASME Y14 Series Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.5 Drawings Without Reference to a Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.6 Reference to Gaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.7 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section 2 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Cited Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Additional Sources (Not Cited) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Section 3 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 4 Fundamental Rules, Tolerancing Defaults, and Dimensioning Practices . . . . . . . . . . . 12
4.1 Fundamental Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Units of Measure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Types of Dimensioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 Application of Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Dimensioning Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Location of Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Section 5 Tolerancing, Interpretation of Limits, Limits of Size, and Material Condition Modifiers 33
5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.2 Direct Tolerancing Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.3 Tolerance Expression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.4 Interpretation of Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.5 Single Limit Toleranced Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.6 Tolerance Accumulation Between Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.7 Dimensions Related to an Origin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.8 Limits of Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.9 Applicability of Modifiers on Geometric Tolerance Values and Datum Feature References . 36
5.10 Screw Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.11 Gears and Splines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.12 Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.13 Angular Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.14 Conical Tapers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
iii
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