ASME B1.21M-1997(2018) 公制螺纹MJ型(英文版).pdf

1997,ASME,国外及港澳台标准
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METRIC

SCREW THREADS: MJ PROFILE

(Revision of ANSI B1.21M-1978)

REAFFIRMED2018

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METRIC SCREWTHREADS: MJPROFILE

This Standard will be revised when the Society approves the issuance ofrequirements of this Standard issued to this edition.

ASME is the registered trademark of The American Society of Mechanical Engineers.

This code orstandard wasdeveloped underrocedures accreditedasmeeting the criteria foAmerican National Standards. The Consensus Commitee that approved the code or standard opportunity to participate.The proposed code or standard was made available for public review eregulatory agencies and the public-atlarge. and ment which provides an opportunity for additional public input from industry academia

ASME does not “approve *rate or *endorse any item construction proprietary device or activity.

connection with any items mentioned in this document and does not undertake to insure anyone ss s duejo o s uod ue e ou sopSany such liability. Users of a code or standard are expressly advised that the determination of utilizing a standard against liability forinfringement of any applicable Letters Patent norassumesAge s suu yons jo suwuu a jo xu ug puesu ued uons Aue o Apen o

thelr own responsibility.

be interpreted as government or industry endorsement of this code or standard. Participation by federal agency representativelsl or personisi affiliated with industry is not to

ASME procedures and policies which preclude the issuance of interpretations by individual ASMEacceptsresponsibiityfornlythoseinterpretatinsissudinaccrdancewithgoverningvolunteers.

No part of this document may be reproduced in any form in an electronic retrieval system or otherwise nd jo usd u od nThe American Society of Mechanical Engineers345 East 47th Street New York NY 10017Copyright1998byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights ReservedPrinted in U.S.A.

FOREWORD

(This Foreword is not part of ASME B1.21M-1997.)

This Metric Screw Thread Standard MJ Profil is a hard metric version similar to theUNJ Inch ASME B1.15 and M1L-S-8879 Standards which have a 0.15011P to 0.18042P controlled radius root in the extemal thread and the intermal thread minor diameter truncatede to acmodate the extermal thread maximum root radius. This metric thread is remended

Tolerancc Class 4H5H/4h6h is approximately equivalent to a Class 3A/3B Inch J Thread

Tabulated data has been provided for Tolerance Class 4g6g and 4G6G/4GSG for mercialis not adequate for the coating thickness required. applications or when the standard reduction for coating or plating provided in this Standard

Table 6 in this issue has been added to define limiting dimensions for Tolerance Class6g/6H for mercial producers and users of this class. Tolerance Class 6g/6H is intended for use only in mercial applications.

SAE E21/E25 Metric Thread Panel which developed and published SAE Aerospace Standard This metric Standard has as its original basis the work done under the direction of theAS 1370. A replica of AS 1370 was ballot circulated in American National StandardsInstitute Committee B1 as ANSI B1.21.

Since theUNJ inch screw thread is predominantly used in aerospace designs theaerospacescrew thread project was initiated by SAE Commitee E21 which was responsible for industry decided to produce a hard metric version for aerospace metric design. The MJaerospace propulsion design standards. At the Commitee's October 25 1971 meeting.aerospace fasteners and threaded parts.

aerospace industry. Participating organizations included the following: A metric thread panel was organized to include representation from throughout the

SAE/E21 - Aerospace Propulsion Design StandardsSAE/E25 -Aerospace Propulsion Utility Parts StandardsAIA/NASC - National Aerospace Standards Committee (airframe) ATAAir Transport AssociationSBAC -Society of British Aircraft Constructors ALMA - American Locknut Manufacturers AssociationAPFA Aerospace Precision Fastener AssociationNAPTC - Naval Air Propulsion Test Center U.S. Navy ASD/WPAFB -Aeronautical Systems Division U.S. Air ForceLiaison representation from ANSI/OMFS

TC 20/SC 4. and ISO/TC 1/SC 5 in order to reflect agreements patible with intemational This Panel took into account thc activities of ANSI/OMFS SBAC ATA AECMA ISO/and US. aerospace metric screw thread requirements as well as coordinating with ANSI/ OMFS requirements.

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