1、ASME B18.25.3111-1998 SQUARE AND RECTANCiUlAR KEYS AND KEYWAYS: WIDTH TOLERANCES AND DEVIATIONS GREATER THAN BASIC SUE AN AMERICAN NATIONAL STANDARD The American Society of Mechanical Engineers STDOASME B18.25.3M-ENGL 1998 IPI 0759b70 b08339 30b m The American Society of Mechanical Engineers AN AMER
2、ICAN NATIONAL STANDARD SQUARE AND RECTANGULAR KEYS AND KEYWAYS: WIDTH TOLERANCES AND DEVIATIONS GREATER THAN BASIC SIlE ASME B18.25.3M-1 NM8 Date of Issuance: January 29, 1999 This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda or written i
3、nterpretations of the requirements of this Standard issued to this edition. ASME is the registered trademark of The American Society of Mechanical Engineers. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards committ
4、ee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from i
5、ndustry, 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
6、 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 ris
7、k of infringement of such rights, is entirely their own responsibility. Participation by federal agency representativeis) 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 interpre
8、tations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers. 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 publis
9、her. The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990 Copyright O 1999 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. FOREWORD (This Foreword is not part of ASME 818.25.3M-1998) The ASME Subcommittee B18.25 was created in 1
10、994. This subcommittee then assumed the responsibilities of ANSI Standards Committee B 17. The first endeavor of this subcommittee was to create U.S. standards for metric square and rectangular and Woodruff keys and keyways. ASME B18.25.1M covers square and rectangular keys and keyways based on the
11、IS0 standard with modifications to reflect U.S. manufacturing and user needs. ASME B 18.25.2M covers Woodruff keys and keyways based on the IS0 standard with modifications to reflect US. manufacturing and user needs. This Standard covers what would be referred to as a “commercial” grade of square an
12、d rectangular keys and keyways. There is no IS0 standard for the keys and keyways covered by this Standard. The following document was balloted on March 6, 1998. Following approval by ASME, the document was submitted to the American National Standards Institute. This Standard was approved by ANSI on
13、 June 17, 1998. . 111 STD*ASME B18-25.3M-ENGL ASME STANDARDS COMMITTEE BI8 Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners (The following is the roster of the Committee at the time of approval of this Standard.) OFFICERS D. A. Clever, Chair R. D. Strong, Vice Chair S.
14、W. Vass, Vice Chair R. W. McGinnis, Secretary COMMITTEE PERSONNEL J. C. Akins, Safety Socket Screw Corp. J. Altman, Rotor Clip Co. J. B. Belford, Lawson Products, Inc. J. A. Buda, SPS Technologies D. A. Clever, Deere i3 Co. A. P. Cookrnan, Ford Motor Co. T. Collier, Cam-Tech Industries, Inc. A. C. D
15、iCola, Wrought Washer Manufacturer, Inc. A. Dinh, Defense Industrial Supply Center W. D. Downing, Black and Decker B. A. Dusina, Federal Screw Works D. S. George, Ford Motor Co. B. Hasiuk, Defense Industrial Supply Center A. C. Hood, ACH Technologies J. Hubbard, Rockford Fastener, Inc. F. W. Kern, S
16、ociety of Automotive Engineers W. H. Kopke, ITW Shakeproof Industrial Products J. G. Langenstein, Consultant M. Levinson, ITW Shakeproof Industrial Products L. L. Lord, Caterpillar, Inc. A. D. McCrindie, Genfast Manufacturing Co. K. E. McCullough, Consultant R. F. Novotny, Textron M. D. Prasad, Gene
17、ral Motors Corp. J. H. Class, Rotor Clip W. Schevey, BGM Fastener Co. J. F. Sullivan, National Fasteners Distribution Assoc. R. L. Tennis, Caterpillar, Inc. R. G. Weber, BEI School of Engineering C. J. Wilson, Inductrial Fasteners Institute V SUBCOMMITTEE 25 - KEYS AND KEYWAYS J. G. Langenstein, Cha
18、ir, Caterpillar, Inc. D. A. Clever, Deere 81 Co. A. Herskovitz, U. S. Army ARDEC W. H. Kopke, ITW Shakeproof Industrial Products K. E. McCullough, Consultant R. S. Merrick, Jr., Standard Horse Nail Corp. J. F. Sullivan, National Fasteners Distribution Assoc. O. J. Trinko, ITW Medalist Leitzke C. J.
19、Wilson, Industrial Fasteners Institution vi STD-ASME B18-25.3M-ENGL L99 m 0759b7 Ob08344 773 D CORRESPONDENCE WITH BI8 COMMITTEE Generrrl. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with
20、the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Correspondence should be addressed to: Secretary, B 18 Main Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 1001 6-5990 Proposing Revisions. Revisions are made pe
21、riodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposais shou
22、ld be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Inrerpretations. Upon request, the B 18 Committee will render an interpretation of any requirement of the Standard.
23、Interpretations can only be rendered in response to a written request sent to the Secretary of the BI8 Main Committee. The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit hisher request in the following format: Subject: Cite the applicab
24、le paragraph numberts) and the topic of the inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested. Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a r
25、equest for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings, which are necessary to explain the question; however, they should not contain proprietary names or information. Requests that are not in this format may be rewritten in the appropriate f
26、ormat by the Committee prior to being answered, which may inadvertently change the intent of the original request. ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. Further, persons aggrieved by an in
27、terpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity. Attending Committee Meefings. The B 18 Main Committee regularly holds meetings, which are open to the public. Per
28、sons wishing to attend any meeting should contact the Secretary of the B18 Main Committee. STD-ASME BL8.25.3M-ENGL 1778 m 0759b70 b08345 bOT m CONTENTS . Foreword 111 Standards Committee Roster . v vii Correspondence with B 18 Committee . 1 Introductory Notes . 1 1.1 Scope . . 1.2 Comparison With IS
29、0 R773-I969 and 2491-1974 . 1.3 Dimensions 1.4 Tolerances 1.5 Terminology . 1.6 Referenced Standards . 1.7 Designation 1 1 .8 Preferred Lengths and Tolerances 2 Requirements 2 2.1 Material 2 2.2 Dimensions and Tolerances 2 I Dimensions for Square and Rectangular Parallel Keys 3 2 Dimensions and Tole
30、rances for Keyways 5 Tables ASME 618.25.3M-1998 SQUARE AND RECTANGULAR KEYS AND KEYWAYS: WIDTH TOLERANCES AND DEVIATIONS GREATER THAN BASIC SIZE INTRODUCTORY NOTES 1.1 Scope 1.1.1 This Standard covers requirements for square and rectangular parallel keys and keyways intended for both alignment of sh
31、afts and hubs, and transmitting torque between shafts and hubs. 1.1.2 Keys covered by this Standard have a rela- tively loose width tolerance. All width tolerances are positive. Keys with minus width tolerances and a smaller tolerance range are covered by ASME B 18.25.lM. 1.1.3 The inclusion of dime
32、nsional data in this Standard is not intended to imply that all sizes described are production stock items. Consumers should consult with suppliers concerning lists of stock items. 1.2 Comparison With IS0 R773-1969 and 2491 -1 974 This Standard has greater tolerances than IS0 Stan- dards R773- 1969
33、and 249 1 - 1974. Product manufactured to this Standard is not interchangeable dimensionally with product manufactured to the IS0 standards nor is product manufactured to the IS0 standards dimension- ally interchangeable with product manufactured to this Standard. IS0 standards do not include harden
34、ed keys. 1.3 Dimensions Unless otherwise specified, all dimensions in this Standard are in millimeters. 1.4 Tolerances Many of the tolerances shown in Tables 1 and 2 are from ANSI 84.2 (IS0 286-1 and IS0 286-2). As a result, in addition to plus-minus tolerances which are common in the U.S., some are
35、 expressed as plus-plus deviations from the basic size. For further interpretation of these tolerances, refer to ANSI B4.2 or IS0 286. 1.5 Terminology For definitions of terms related to fasteners or compo- nent fasteners used in this Standard, refer to ANSI B 18.12. 1.6 Referenced Standards ANSI B1
36、8.12, Glossary of Terms for Mechanical Fas- teners ASME B18.25.1M, Square and Rectangular Keys and Keyways IS0 Standard R773-69, Rectangular or Square Parallel Keys and Their Corresponding Keyways IS0 Standard 2491-1974, Thin Parallel Keys and Their Corresponding Keyways (Dimensions in millimeters)
37、IS0 Standard 286-1-1988, IS0 System of Limits and Fits - Bases of Tolerances, Deviations and Fits IS0 Standard 286-2-1988, IS0 System of Limits and Fits - Tables of Standard Tolerance Grades and Limit Deviations for Holes and Shafts Referenced ASME standards may be obtained from the American Society
38、 of Mechanical Engineers, 22 Law Drive, Box 2300, Fairfield, New Jersey 07007-2300 Referenced ANSI and IS0 standards may be obtained from the American National Standards Institute, 11 West 42nd Street, New York, NY 1.7 Designation Keys conforming to this Standard shall be designed by the following d
39、ata, preferably in the sequence shown: (a) ASME document number, (b) product name, (c) nominal size (width (b) x height (h) x length), (e) hardness (if other than non-hardened) or option- ally by ASME B 18.24.1, Part Identification Number (PIN) Code System Standard for B18 Externally Threaded Produc
40、ts. EXAMPLES: (I) K253NAB003020302NNAA 1 (2) K253NBFO10040302NNAA 1 (4 style, STD-ASME B18.25-3M-ENGL 1778 I0757670 Ob08347 482 I ACME 618.25.3M-1998 1.8 Preferred Lengths and Tolerances Preferred lengths and tolerances of square and rectan- gular keys are shown below. Tolerances are JS16 from ANSI
41、B4.2. To minimize problems due to lack of straightness, key length should be less than 10 times the key width. Lenpth +Tolerances 6 8, IO 12, 14. 16, 18 20, 22. 25, 28 32. 36, 45, 50 56, 63, 70, 80 90, 100, 110 125, 140, 160, 180 200, 220, 250 280 320, 360, 400 0.375 0.45 0.55 0.65 0.80 0.95 1.1 I .
42、25 I .45 I .6 I .8 SQUARE AND RECTANGULAR KEYS AND KEYWAYS 2 REQUIREMENTS 2.1 Material Standard steel keys shall have a hardness of 183 HV minimum. Hardened keys shall be alloy steel through hardened to a Vickers hardness of 390 to 510 HV. When other materials and properties are required, these shal
43、l be as agreed upon by the supplier and customer. 2.2 Dimensions and Tolerances Dimensions and tolerances for square and rectangular keys are shown in Table 1. Recommended dimensions and tolerances for keyways are shown in Table 2. 2 STD-ASME BL8.25.1M-ENGL 1998 E 0759b70 Ob08348 319 Width, b Basic
44、Size Tolerance SQUARE AND RECTANGULAR KEYS AND KEYWAYS ASME B18.25.3M-1998 Chamfer or Thickness, Radius, h s Range of Lengths Basic Size Tolerance Min. Max. From To b y = Sharp edges removed not to exceed s max. Y Style A Style B Style C 2 +0.040 2 +0.040 6 3 -0.000 3 -0.000 0.16 0.25 6 4 4 8 5 +0.0
45、45 5 +0.045 10 6 -0.000 6 -0.000 0.25 0.40 14 -_ 20 36 Note (1) 45 Note (111 56 Note (li1 70 Note (1)l +0.045 -0.000 +0.050 -0.000 10 I 1 I ;:,.i%: 1 1 ;: 1 56 Note (li1 +0.175 0.25 0.40 70 Note (I) I -0.000 I J 6 I +0.175 I -0.000 0.40 0.60 22 110 Note (li1 8 +o. 190 -0.000 (Table 1 continues on ne
46、xt page) 3 STD-ASME BL8-25.3M-ENGL 1998 0759b70 Ob08347 255 m Chamfer or Width, Thickness, Radius, b h S Basic Size Tolerance Basic Size Tolerance Min. Max. ASME B18.25.3M-1998 SQUARE AND RECTANGULAR KEYS AND KEYWAYS Range of Lengths From To 6 8 6 9 7 10 l4 I +O. 175 -0.000 +o. 190 -0.000 +O. 175 -0
47、.000 +o. 190 -0.000 71 -0.000 45 50 56 63 70 80 90 180 Note (1)l 200 Note (1)l 220 Note (li1 260 Note (I) 280 Note (111 320 Note (1)l 360 (Note (li1 I+ +0.210 56 63 . +0.125 70 -0.000 80 90 +O. 135 1 O0 -0.000 32 32 36 +0.310 40 -0.000 45 50 0.40 0.60 1 .o0 1.60 - 2.50 0.60 - 0.80 1.20 2.00 - 3.00 2
48、8 1140 Note ilil 36 160 Note (111 100 I400 Note (li1 4 STDnASME BL8*25*3M-ENGL 1798 D 0757b70 Ob08350 T77 D SQUARE AND RECTANGULAR KEYS AND KEYWAYS u a L 3 .- B -! O0 c- oo c! m - -! O0 F o Em 9 .e_ b O0 mcn -9 o0 + mm or. wo mm + + -9 O0 gg -I O mi- O0 o O0 mm gg + mm r.b (o0 (ob O0 + + 99 88 Ji- m
49、o m* Ji- n-/ 99 O0 00 O0 00 *o O0 o0 *w mo 90 74 -i- mm r.m O0 + 99 :52 8 + 81 fC 88 + I O O c ml O3 t W 5i m 4 m m ml- ml m 5 ASME 818.25.3M-1998 SQUARE AND RECTANGULAR KEYS AND KEYWAYS al Y al L c ai c c z al D W o 8 al al 8 L L c ._ E E 3 ._ X ; al 5 ln ai m 0 U C i- ._ ._ ai 5 ._ m 5 ai Y ai -0 8 m ai Y al 5 5 3 n 2 C W al +- al c al o - s ; E .- X al 5 03 al m o U t i- ._ .- 2 8 m i- ._ f U ai - 22 :z 5 CY -5 OU g 0- 2 20 o =I- r.j - s+ + + oooooc SC v) JJ O0 g2 o0 8: v- 00 + om ON 22 + om em 22 + J O m -k o O mm 28 + om ON O0 + y- I ICI J
