1、1 ABMA 2025 M Street, NW Suite 800 Washington, DC 20036 Ph: 202-367-1155 Fax: 202-367-2155 E-mail: infoamericanbearings.org www.americanbearings.org ANSI/ABMA 20:2011 Accredited Standards Committee B3 Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types - Metric Design ANSI/ABMA 20
2、:2011 Secretariat American Bearing Manufacturers Association ANSI/ABMA 20:2011 2 AMERICAN NATIONAL STANDARD (This is not an approved part of the standard) Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for
3、approval have been met by the standards developer. Consensus means substantial agreement has been reached by directly and materially affected interests. This signifies the concurrence of more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be c
4、onsidered, and that an effort be made toward their resolution. The use of an American National Standard is completely voluntary; their existence does not in any respect preclude anyone, whether they approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes
5、, or procedures not conforming to the standard. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American
6、National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat of the sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any tim
7、e. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute or online at www.ANSI.org. Published by American Bearing Manufacturers Association 2025 M Street, N.W., Suite 800 Washington, DC 20036 Copyrig
8、ht 2011 by American Bearing Manufacturers Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America 3 RADIAL BEARINGS OF BALL,
9、CYLINDRICAL ROLLER AND SPHERICAL ROLLER TYPES, METRIC DESIGN CONTENTS Section Page RADIAL BEARINGS OF BALL, CYLINDRICAL ROLLER AND SPHERICAL ROLLER TYPES, METRIC DESIGN 1. Scope 8 2. Basic Plan For Boundary Dimensions Of Radial Bearings . 8 3. Radial Bearings With Locating Snap Ring 18 4. Radial Bal
10、l Bearings With Flanged Outer Ring . 23 5. Special Case Chamfer Dimension Limits 26 6. Tolerances 29 ANNEX A 1. Introduction . A1 2. Conversion A1 3. List of Tables with Inch Unit Conversions . A1 4. Symbols. A2 LIST OF TABLES Table No. Page TABLE 1 PART 1 Basic plan for boundary dimensions of metri
11、c radial ball and roller bearings (except tapered roller bearings) 11 TABLE 1 PART 2 Basic plan for boundary dimensions of metric radial ball and roller bearings (except tapered roller bearings) 13 TABLE 2 - PART 1 Snap ring groove dimensions for dimension series 18 and 19 . 19 TABLE 2 - PART 2 Snap
12、 ring groove dimensions for diameter series 0, 2, 3 and 4 (except dimension series 00, 82 and 83) 20 TABLE 3 - PART 1 Snap ring dimensions for dimension series 18 and 19 . 21 TABLE 3 - PART 2 Snap ring dimensions for diameter series 0, 2, 3 and 4 (except dimension series 00, 82 and 83) 22 TABLE 4 Fl
13、ange dimensions for radial ball bearings . 24 4 TABLE 5 Chamfer dimensions for the groove side of the outer ring of bearings with snap ring groove 27 TABLE 6 Chamfer dimensions for the non-thrust side of the outer ring of single-row, angular contact bearings . 27 TABLE 7 Chamfer dimensions for the l
14、oose rib and non-rib sides of the outer ring of single-row, cylindrical roller bearings . 28 TABLE 8 Tolerance class ABEC-1, RBEC-1 (ISO tolerance class normal). 30 TABLE 9 Tolerance class ABEC-3, RBEC-3 (ISO tolerance class 6) 32 TABLE 10 Tolerance class ABEC-5, RBEC-5 (ISO tolerance class 5) 34 TA
15、BLE 11 Tolerance class ABEC-7, RBEC-7 (ISO tolerance class 4) . 35 TABLE 12 Tolerance class ABEC-9, RBEC-9 (ISO tolerance class 2) 36 TABLE 13 Flange outside diameter tolerances 37 TABLE 14 Tolerances for tapered bores for normal tolerance class . 39 TABLE 15 Chamfer dimension limits, radial bearing
16、s 41 TABLE 16 Chamfer dimension limits, special cases groove side of the outer ring of bearings with snap ring groove and loose rib side of single row, cylindrical roller bearing rings 42 TABLE 17 Chamfer dimension limits, special cases non-rib sides of single row cylindrical roller bearing rings an
17、d non-thrust side of the outer ring of single row angular contact ball bearings 43 TABLE 18 Chamfer dimension limits, special cases radial cylindrical roller bearings with extra large bore chamfer 44 TABLE 19 Radial internal clearance values for radial contact groove ball bearings with cylindrical b
18、ore . 45 TABLE 20 5 Radial internal clearance values for cylindrical roller bearings with cylindrical bore . 46 TABLE 21 Radial internal clearance values for cylindrical roller bearings with cylindrical bore and extra large bore chamfer . 47 TABLE 22 Radial internal clearance values for double row,
19、self-aligning roller bearings with cylindrical bore . 48 TABLE 23 Radial internal clearance values for double row, self-aligning roller bearings with tapered bore 49 TABLE 24 Radial internal clearance values for double row, self-aligning ball bearings with cylindrical bore . 50 TABLE 25 Radial inter
20、nal clearance values for double row, self-aligning ball bearings with tapered bore 50 TABLE A2 - PART 1 Snap ring groove dimensions for dimension series 18 and 19 . A3 TABLE A2 - PART 2 Snap ring groove dimensions for diameter series 0, 2, 3 and 4 (except dimension series 00, 82 and 83) A4 TABLE A3
21、- PART 1 Snap ring dimensions for dimension series 18 and 19 . A5 TABLE A3 - PART 2 Snap ring dimensions for diameter series 0, 2, 3 and 4 (except dimension series 00, 82 and 83) A6 TABLE A4 Flange dimensions for radial ball bearings . A7 TABLE A5 Chamfer dimensions for the groove side of the outer
22、ring of bearings with snap ring groove A9 TABLE A6 Chamfer dimensions for the non-thrust side of the outer ring of single-row, angular contact bearings (except dimension series 09, 00, 82 and 83) A9 TABLE A7 Chamfer dimensions for the loose rib and non-rib sides of the outer ring of single-row, cyli
23、ndrical roller bearings (except dimension series 00, 82 and 83) A10 TABLE A8 Tolerance class ABEC-1, RBEC-1 (ISO tolerance class normal) . A11 TABLE A9 Tolerance class ABEC-3, RBEC-3 (ISO tolerance class 6) A13 TABLE A10 Tolerance class ABEC-5, RBEC-5 (ISO tolerance class 5) A15 6 TABLE A11 Toleranc
24、e class ABEC-7, RBEC-7 (ISO tolerance class 4) A16 TABLE A12 Tolerance class ABEC-9, RBEC-9 (ISO tolerance class 2) A17 TABLE A13 Flange outer diameter tolerances . A18 TABLE A14 Tolerances for tapered bores for normal tolerance class A18 TABLE A15 Chamfer dimension limits, radial bearings A19 TABLE
25、 A16 Chamfer dimension limits, special cases groove side of the outer ring of bearings with snap ring groove and loose rib side of single row, cylindrical roller bearing rings A20 TABLE A17 Chamfer dimension limits, special cases non-rib sides of single row cylindrical roller bearing rings and non-t
26、hrust side of the outer ring of single row angular contact ball bearings A21 TABLE A18 Chamfer dimension limits, special cases radial cylindrical roller bearings with extra large bore chamfer A22 TABLE A19 Radial internal clearance values for radial contact groove ball bearings with cylindrical bore
27、 . A23 TABLE A20 Radial internal clearance values for cylindrical roller bearings with cylindrical bore . A24 TABLE A21 Radial internal clearance values for cylindrical roller bearings with cylindrical bore and extra large bore chamfer . A25 TABLE A22 Radial internal clearance values for double row,
28、 self-aligning roller bearings with cylindrical bore. A26 TABLE A23 Radial internal clearance values for double row, self-aligning roller bearings with tapered bore A27 TABLE A24 Radial internal clearance values for double row, self-aligning ball bearings with cylindrical bore . A28 TABLE A25 Radial
29、 internal clearance values for double row, self-aligning ball bearings with tapered bore. A28 7 LIST OF FIGURES Figure No. Page Figure 1 - Graphical representation of the diameter and width series components of the dimension series of the boundary plan for radial bearings . 10 Figure 2 - Snap ring a
30、nd snap ring groove dimensions . 18 Figure 3 - Flanged outer ring dimensions 23 Figure 4 - Bearing with locating snap ring . 26 Figure 5 - Cylindrical roller bearings 26 Figure 6 - Angular contact bearing 26 Figure 7 - Tapered bore dimensions . 38 Figure 8 - Tapered bore with mean diameters and thei
31、r deviations 38 Figure 9 - Chamfer dimensions . 40 Figure 10 - Configurations for cylindrical roller bearings with extra large bore chamfer 44 8 RADIAL BEARINGS OF BALL, CYLINDRICAL ROLLER AND SPHERICAL ROLLER TYPES, METRIC DESIGN 1. Scope This standard includes: (a) basic plan for the boundary dime
32、nsions of metric radial ball and roller bearings; (b) general rules for extension of the basic plans; (c) dimensions and tolerances for snap ring groove and locating snap rings; (d) dimensions for radial ball bearings with flanged outer ring; and (e) tolerances for boundary dimensions, chamfers, var
33、ious runouts and internal clearance. This standard does not contain any direction pertaining to internal bearing design nor any indication as to availability of bearings. Airframe bearings, instrument ball bearings, needle roller bearings, tapered roller bearings, thrust bearings and other bearing t
34、ypes and series not conforming to these basic plans for boundary dimensions are covered in other ANSI/ABMA Standards. 2. Basic plan for boundary dimensions of radial bearings 2.1 Object of the plan. The object of this plan is to reduce the number of sizes as much as possible so as to promote economi
35、c production and yet to provide a sufficient number of sizes and proportions to satisfy present and future needs of bearing users. These needs are comprehensive and varying. Therefore, the plan embraces a wide range of bearing sizes and proportions which, when the needs arise, may be extended in acc
36、ordance with the general rules given in the Standard. Bearing manufacturers should select from the basic plan those sizes and proportions that are suitable for the bearing types and applications under consideration. Bearing users should select bearings from manufacturers specifications, giving prefe
37、rence to those bearings whose dimensions conform to the basic plan. Another object of this plan is to achieve the benefits of international standardization of bearing dimensions. This has been accomplished due to the fact that this plan was developed in cooperation with the International Organizatio
38、n for Standardization (ISO) and generally conforms to those standards adopted by ISO. Differences from ISO standards are noted in the text or tables of this standard. 2.2 Metric and inch equivalents. Metric bearings of dimensions conforming to the plan are manufactured in plants using the metric sys
39、tem of measurement and also in plants using the inch system of measurement. When the inch system is used, the basic metric boundary dimensions are converted to equivalent inch dimensions in accordance with ANSI/IEEE 268 carried to four decimal places. The metric dimensions and their equivalent inch
40、dimensions differ by 0.00005 inch or less (except for width in radial dimensions series 32, 92, 33, and 93), an amount that is too small to be of practical significance. Therefore bearings made to either system of measurement are equally acceptable as being in accord with this standard. Most ball an
41、d cylindrical roller bearings, manufactured in USA to the radial dimension series 32, 92, 33, and 93 have fractional inch width dimensions. When converting these to millimeters carried to one decimal place, the resulting discrepancy is 0.05 mm (0.002 inch) or less which in this case is too small to
42、be of practical significance. 9 2.3 Non-ISO dimensions. In addition to those dimensions identified that differ from those in ISO standards, this standard contains chamfer dimensions and radial internal clearance limits for a radial cylindrical roller bearing which has bore and outside diameter dimen
43、sions conforming to the Basic Plan for Boundary Dimensions given in Table 1, but has an extra large chamfer on one side and a broken small corner on the other side (see Tables 18 and 21). 2.4 Symbols. The symbols (except those for tolerances) shown in the figures and the values given in the tables d
44、enote nominal dimensions unless noted otherwise. d = bore diameter D = outside diameter B = inner ring width C = outer ring width rs min = smallest single chamfer dimension 2.5 Boundary plan for radial bearings. The boundary dimensions d, D and B or C of the plans are developed as follows: 2.5.1 Bor
45、e diameter, d. Bore diameters covering sizes from 0.6 mm to 2000 mm are established in increments sufficiently small to satisfy user requirements and at the same time sufficiently large to eliminate unnecessary sizes (see Table 1, columns 1, 29, and 48). 2.5.2 Diameter series. For most bore diameter
46、 sizes a number of progressively increasing series of outside diameters is provided to allow further choice of bearing design and capacity. These series are termed diameter series 7, 8, 9, 0, 1, 2, 3, and 4 and are listed in Table 1 in columns headed 2, 8, 18, 30, 40, 49, 59, and 68. 2.5.3 Width ser
47、ies. In addition, each diameter series is provided with a number of progressively increasing width series to allow even greater choice of bearing design and capacity. These width series are numbered 8, 0, 1, 2, 3, 4, 5, 6, and 9 and are listed in Table 1 in columns headed 3-6, 9-15, 19-25, 31-37, 41
48、-45, 50-56, 60-65, and 69-70. 2.5.4 Dimension series. These width and diameter series numbers are combined into two digit numbers termed dimension series. The bore diameter size and the dimension series number that identifies all three basic dimensions of a bearing: bore, outside diameter and width.
49、 For example, a radial bearing having a 40 mm bore in the 02 dimension series has an outside diameter of 80 mm and a width of 18 mm (See Table 1, Part 3). Figure 1 indicates graphically how the diameter and width series each progress for a given bore size. Table 1 shows the various bearing proportions now included in the basic plan. 2.5.5 Chamfers. The values for inner and outer ring chamfer dimensions given in Table 1 (columns headed 7, 16-17, 26-28, 38-39, 46-47, 57-58, 66-67 and 71) are minimum limits, rs min, The corresponding maximum limits, rs max, are given i
