1、AN AMERICAN NATIONAL STANDARD ASME B18.27b-2000 ADDENDA to ASME B18.27-1998 TAPERED AND REDUCED CROSS SECTION RETAINING RINGS (INCH SERIES) THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Three Park Avenue New York, NY 10016 Date of Issuance: November 15, 2000 ASME is the registered trademark of The Am
2、erican Society of Mechanical Engineers. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests h
3、ave had 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
4、, 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
5、applicable letters patent, nor assumes 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
6、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 is
7、suance 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 Three Park Avenue, New York, NY 10016-5990 Copyright 8
8、 2000 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. ASME B18.27b-2000 Following approval by the ASME Bi8 Committee and ASME, and after public review, ASME B18.27b- 2000 was approved by the American National Standards Institute on February Il, 2000. Addenda to
9、the 1998 edition of ASME B 18.27 are issued in the form of replacement pages. Revisions, additions, and deletions are incorporated directly into the affected pages. It is advisable, however, that this page, the Addenda title and copyright pages, and all replaced pages be retained for reference. SUMM
10、ARY OF CHANGES This is the second Addenda to be published to ASME B18.27-1998. A previous Addenda was published in May 2000. Replace or insert the pages listed. Changes given below are identified on the pages by a margin note, (b), placed next to the affected area. Previous Addenda changes are indic
11、ated by (a). The pages not listed are the reverse sides of the listed pages and contain no changes. Page Location Change Updated to reflect Addenda 111 Foreword ix Preface Updated to reflect Addenda . xi 4 5 Contents 3.2.1 Table I Updated to reflect Addenda Revised Revised in its entirety 3.3.1 Revi
12、sed 19 1-224 ASME B18.27.5 Added FOREWORD American National Standards Committee B27 for the standardization of plain and lock washers was organized in March 1926 as Sectional Committee B27, under the aegis of the American Standqrds Association (later the United States of America Standards Institute
13、and, as of October 6, 1969, the American National Standards Institute, Inc.), with the Society of Automotive ,Engineers and The American Society of Mechanical Engineers as joint secretariats. In 1950, this Committee was designated as responsible for the standardization of washers and ,machine rings.
14、 At a meeting of ANSI B27 Standards Committee held on February 4, 1971, it was recommended to the secretariats (ASME and SAE) that Subcommittees I, 2, and 4 on Washers be merged into ANSI B18 Standards Committee and that Subcommittee 3 on Retaining Rings become a separate Standards Committee retaini
15、ng the B27 designation. This change was subsequently approved by ANSI. Formation of Subcommittee 1 on Tapered and Reduced Section Retaining Rings was authorized by Standards Committee B27 at its meeting on October 15, 1974. At this meeting, it was decided that no further effort should be expended on
16、 inch dimensional products and Subcommittee 1 was assigned the responsibility of preparing American metric standards for tapered and reduced section retaining rings. Subcommittee 1 prepared a draft proposal, General Purpose Tapered and Reduced Cross Section Retaining Rings, which was balloted on Jun
17、e 16, 1975. At a subcommittee meeting held on February 17, 1976, results from the letter ballot were reviewed. The proposal was accepted by the Subcommittee and presented to the B27 Standards Committee at its May 7, 1976, meeting. At that meeting, a letter ballot of the entire committee was authoriz
18、ed. The Standard was duly approved by the Committee and its sponsors and submitted to the American National Standards Institute for designation as an American Standard. This designation was granted on October 20, 1977. It was recommended that American National Standards Committee B27 be made part of
19、 ASME BI8 Main Committee. As a result, Subcommittee 27 of ASME BIS has the responsibility of developing and maintaining standards for retaining rings. A need evolved for commercial and military requirements to develop inch series standards for General Purpose Tapered and Reduced Cross Section Type R
20、etaining Rings. It was agreed by the ASME BI8 Main Committee to have Subcommittee 27 develop these required inch series standards. The first of the inch standards, B18.27.1, covering External Type NAI, Internal Type NA2, and E-Ring Type NA3 rings, was approved by ANSI on July 16, 1998. The second of
21、 the inch standards, B18.27.2, covering Heavy Duty External Type NA4, Reinforced E-Rings NA5, and C-Rings Type NA6, was approved by ANSI on July 16, 1998. The third of the inch standards, B18.27.3, covering Bowed External Rings NA7, Bowed Internal Rings NA8, and Bowed External E-Rings NA9, was appro
22、ved by ANSI on July 16, 1998. The fourth of the inch standards, B18.27.4, covering Inverted External Rings NAIO, Inverted Internal Rings NA1 1, Beveled External Rings NA12, and Beveled Internal Rings NA13, was approved by ANSI on May 10, 1999. . 111 The fifth and final of the inch standards, B 18.27
23、.5, covering External Self-Locking Rings Type NA14, External Interlocking Rings Type NA15, and Extemal Bowed Locking Prongs Rings NA16, was approved by ANSI on February II, 2000. iv PREFACE ORGANIZATION OF THIS DOCUMENT This Standard compiles the following standards: Standard Title ASME B18.27.1 ASM
24、E B18.27.2 External Type NAl, Internal Type NA2, E-Ring Type NA3 Heavy Duty External Type NA4, Reinforced E-Rings NA5, C-Rings Type NA4 ASME B18.27.3 Bowed External Rings NA7, Bowed Internal Rings NA8, Bowed External E-Rings NA9 ASME B 18.27.4 Inverted External NA 10, Inverted Internal NA 1 1, Bevel
25、ed External NA12, Beveled Internal NA13 ASME BI 8.27.5 External Self-Locking Rings NA14, Extemal Interlocking Rings NA15, External Bowed Locking Prongs Rings NA16 ADDENDA SERVICE This edition of ASME B 18.27- 1998 includes an automatic addenda subscription service up to the publication of the next e
26、dition. The addenda subscription service will include the additional B 18.27 documents not already included in the initial publication and approved revisions to the existing parts. ix CONTENTS . Foreword . III Standards Committee Roster v Correspondence With the B18 Committee vii Preface . ix ASME B
27、18.27.1 ASME B18.27.2 ASME B18.27.3 ASME B18.27.4 ASME B18.27.5 External Type NA1, Internal Type NA2, E-Ring Type NA3 . Heavy Duty External Type NA4, Reinforced E-Rings NA5, Bowed External Rings NA7, Bowed Internal Rings NA8, Bowed Inverted External NA10, Inverted Internal NA1 1, Beveled External Se
28、lf-Locking Rings NA14, External Interlocking Rings 1 C-Rings Type NA6 59 External E-Rings NA9 93 External NA12, Beveled Internal NA13 . 135 NA15, External Bowed Locking Prongs Rings NA16 . 191 xi ASME 818.27.1-1998 EXTERNAL TYPE NAI, INTERNAL TYPE NA2, E-RING TYPE NA3 1 INTRODUCTORY NOTES 1.1 Scope
29、This Standard covers complete general and dimen- sional data for three series of general purpose tapered and reduced cross section retaining rings, which may be used with the nominal size shafts and housings listed and in grooves of the recommended dimensions listed. Also included are formulas and t
30、olerances on which dimensional data are based. Three appendices include guidance for assembly and recommended stan- dard drawing formats. The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Consumers should consul
31、t with suppliers concerning lists of stock production sizes. 1.2 IS0 Standard products. There are no existing IS0 Standards for these 1.3 Ring Types 1.3.1 External Rings. Dimensions of basic external retaining rings and grooves for various shaft sizes are given in Table 6. See Nonmandatory Appendix
32、A for equivalent metric data. 1.3.2 Internal Rings. Dimensions for basic internal retaining rings and grooves for various housing sizes are given in Table 7. See Nonmandatory Appendix C for equivalent metric data. 1.3.3 External E-Rings. Dimensions of E-Type extemal retaining rings and grooves for v
33、arious shaft sizes are given in Table 8. See Nonmandatory Appendix E for equivalent metric data. 1.4 Designations Retaining rings in this Standard shall be designated by the following data in the sequence shown: ring series type number; size; material; protective finish, if required or by, optionall
34、y, ASME B18.24.3 PIN Code. See examples below: NA 1-37, Carbon spring steel, phosphate R27 I NAA0037NN056NNAAI NA2-75, Corrosion resistant steel R27 I NAB7W”N I9NNAB I NA3-SI 18, Beryllium copper R27 I NACS I I8NN643NNAA I 1 .!i Applicability The rings covered by this Standard are intended primarily
35、 for use with the shaft, housing, and groove sizes recommended; however, in certain cases these diameters may be altered somewhat to suit the require- ments of a particular design. When such changes are made, care should be taken to not alter the shaft or housing size to such an extent that the ring
36、 will take enough permanent set to allow a loose fit after the ring has been assembled into the groove. Neither should the groove diameter be altered to the extent to permit the ring to fit loosely. 1.6 Dimensions All dimensions in this Standard are in inches unless otherwise stated. 1.7 Supplementa
37、ry Information Allowable loads, maximum radii and chamfers, clear- ance dimensions, and gaging diameters for all three ring series are included in Mandatory Appendices I, II, and III. RPM limits for extenial basic and external E-rings are included in Mandatory Appendices i and III. 1.8 Reference Sta
38、ndards Unless otherwise specified, the referenced standard shall be the most recent issue at the time of order placement. ASTM E 18, Standard Test Method for Rockwell Hardness and Rockwell Superficial Hardness of Me- tallic Materials 3 - STD*ASME BLB.27B-ENGL 2000 0757b70 ObL9293 277 ASME 818.27.1-1
39、998 ASTM B 117, Standard Practice for Operating Salt Spray (Fog) Testing Apparatus ASTM A 380, Standard Practice for Cleaning and Descaling Stainless Steel Parts, Equipment, and Systems ASTM B 695, Standard Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel ASTM DS-56F/SAE H
40、S- 1086, Unified Numbering Sys- tem (UNS) for Metal and Alloys EXTERNAL TYPE NA1, INTERNAL TYPE NA2, E-RING TYPE NA3 to UNS GI0900 or equivalent and have the following physical properties. 3.1.1 Heat Treatment. The retaining rings shall be heat treated by austempering up to Size 345. For sizes from
41、350 to loot), the rings shall be heat treated by either austempering or by quench and temper. All sizes are to be heat treated to the hardness shown in Table 1. Publisher: The American Society for Testing and Materi- als (ASTM), 100 Barr Harbor Drive, West Consho- hocken, PA 19428-2959 3.1.2 Surface
42、 Treatment 3.1.2.1 Phosphate Coating. Finish shall consist of basic zinc phosphate treatment and subsequent sup- 2 GENERAL DATA plementary treatment to enhance Shelf Life (example of supplementary treatment: wax, light drying oil). 3.1.2.2 Zinc Plating. Finish shall consist of me- chanically applied
43、 zinc with a dichromate conversion treatment similar to ASTM B 695 Type II, Class 8. The resulting treatment shall be capable of withstanding 72 hours to white corrosion Or red IIISt. Corrosion resistance test method shall be Similar to ASTM 117- 2.1 Basic Retaining Rings Type NA1 retaining rings co
44、vered by this Standard are spread over a shaft by means of a pliers or special tool and allowed to relax and seat in a circumferential groove, thereby providing an extemal protruding shoul- der that can be used for locating and retaining a part on the shaft. Type NA2 retaining rings covered by this
45、Standard are compressed into a housing by means of a pliers or special tool and allowed to relax and seat in a circumferential groove, thereby providing an intemal protruding shoulder that can be used for locating and retaining a part contained inside of the housing. In both cases, the rings have a
46、tapered section to provide a more uniform distribution of stresses during expansion or compression. 2.2 E-Type Retaining Rings NOTE: Electroplating has the potential of introducing Hydrogen Embrittlernent. Therefore, its application for retaining rings is not allowed. 3.1.2.3 Oil Finish. To extend S
47、helf Life, rings shall be coated with a thin film of non-tacky water displacing rust preventative oil. 3.2 Corrosion-Resistant Steel Retaining rings made from corrosion-resistant steel shall conform to the chemical composition of UNS SI5700 or equivalent (AISI 632, AMS 5520). Type NA3 retaining ring
48、s Overed by this protective finish, if required; or by, optionally, ASME B18.24.3 PIN Code. See examples below: ASME B 18.27.5. NA14-18. Carbon spring steel, phosphate R275NAA0018NNO56NNAAl ASME B18.27.5, NA14-25. Carbon spring steel, zinc plated R275NAA0025NN056NNDE I ASME 818.27.5, NA15-150, Corro
49、sion-resistant steel R275NABOI 50NN5 I9NNAB 1 ASME B18.27.5. NA16-12. Beryllium copper R275NAC0012NN643NNAA I 1.5 Applicability The rings specified in this Standard are intended primarily for use with the shaft and groove sizes recommended; however, in certain cases these diameters may be altered somewhat to suit the requirements of a particular design. When such changes are made, care should be taken to not alter the shaft size to such an extent that the ring will take enough permanent set to allow a loose fit after the ring has been assembled into the groove. Neither should the
