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1、INTERNATIONAL STANDARD IS0 2901 Second edition 1993-l o-1 5 IS0 metric trapezoidal screw threads - Basic profile and maximum material profiles Filetages mhtriques trapkoidaux IS0 - Profil de base et profils Ei maximum de mat&e Reference number IS0 2901:1993(E) Copyright International Organization fo
2、r Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 2901:1993(E) Foreword IS0 (the International Organization for Standardization) is
3、a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represent
4、ed on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards a
5、dopted by the technical committees are circulatlad to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 2901 was prepared by Technical Committee lSO/TC 1, Screw threads. This :seco
6、nd edition cancels and replaces the first edition (IS0 2901:1977), figures 2 and 3 of which have been technically revised. Q IS0 1993 All rights, reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, lncludlng photocopylng and micr
7、ofilm. wlthout per- mlssion In writing from the publisher. International Organization for Standardization Case Postale 56 9 CH-1211 Gen&e 20 l Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
8、 Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 2901:1993(E) IS0 metric trapezoidal screw threads - Basic profile and maximum material profiles 1 Scope This International Standard specifi
9、es the basic profile and maximum material profiles of IS0 metric trap- ezoidal screw threads. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this international Standard. At the time of publi- cation, the edition indica
10、ted was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent edition of the standard indicated below. Mem- bers of IEC and IS0 maintain registers of currently valid Int
11、ernational Standards. IS0 2903:-“, /SO metric trapezoidal screw threads - Tolerances. 3 Symbols D major diameter of internal thread d major diameter of external thread (nominal di- ameter) D2 d2 DI 4 P H 4 UC es 4 pitch diameter of internal thread pitch diameter of external thread minor diameter of
12、internal thread minor diameter of external thread pitch height of fundamental triangle height of basic profile crest clearance fundamental deviation on external threads*) Basic profile The basic profile is the theoretical profile, and this is associated with the basic sizes of the major, pitch and m
13、inor diameters of the thread. The deviations are ap- plied to the basic sizes. 5 Basic profile dimensions These dimensions are shown in figure 1 and given in table 1. I) To be published. (Revision of IS0 2903:1977) 2) See IS0 2903:1993, table 1. Copyright International Organization for Standardizati
14、on Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 2901:1993(E) Axis of screw thread i Figure 1 - Basic profile 6 Maximum material profiles These pr
15、ofiles have prescribed clearances on the major, rminor and pitch diameters referring to the basic profile. In the case of manufacture by rolling, the profile at the minor diameter can be modified in order to obtain a larger rounding on the root of the thread. The minor diameter d3 of the external th
16、read may in this case be reduced by 0,15P. If modifications of these profiles become necessary, due to the particular methods of manufacture, they shall be agreed between the customer and the manufacturer. 7 Dimensions for maximum material profiles These dimensions are shown in figures 2 and 3 and g
17、iven in either table2 or the following formulae: H, = 0,5P h,=H,=H,+a,=0,5P+u, z = 0,25P = H,/2 d3 = d - 2 x h, = d - 2(0,5P + a,) d2=D2=d-2z=d-0,5P D, =d-2H, =d-P D,=d+2a, s = 0,267 95es R,max. = 0,5a, R,max. = a, Copyright International Organization for Standardization Provided by IHS under licens
18、e with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 2901:1993(E) Table 1 - Basic profile dimensions Dimensions in millimetres Pitch H HP HI P 1,866P 0,933P 0,5P 0,366P 1.5 2,799 1,
19、400 0,75 0,549 2 3,732 1,866 1 0,732 3 5,598 2,799 1.5 1,098 4 7,464 3,732 2 1,464 5 9,330 4,665 2,5 1,830 6 11,196 5,598 3 2,196 7 13,062 6,531 3,5 2,562 8 14,928 7,464 4 2,928 9 16,794 8,397 4,5 3,294 10 18,660 9,330 5 3,660 12 22,392 11,196 6 4,392 14 26,124 13,062 7 5,124 16 29,856 14,928 8 5,85
20、6 18 33,588 16,794 9 6,588 20 37,320 18,660 10 7,320 22 41,052 20,526 11 8,052 24 44,784 22,392 12 8,784 28 52,248 26,124 14 10,248 32 59,712 29,856 16 11,712 36 67,176 33,588 18 13,176 40 74,640 37,320 20 14,640 44 82,104 41,052 22 16,104 Copyright International Organization for Standardization Pro
21、vided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 2901:1993(E) I) It is recommended to provide for a rounding or a chamfer equal to 0.5 or less at the ma
22、jor diameter of the external threads. For rolled screw threads with pitch 2 to 12, it is recommended to provide for a rounding or a chamfer equal to 0.60, or less at the major diameter of the external threads. Figure 2 - Profiles for threads with clearance on the crest and without clearance on the f
23、lank I) It is recommended to provide for a rounding or a chamfer equal to 0.50, or less at the major diameter of the external threads. For rolled screw threads with pitch 2 to 12, it is recommended to provide for a rounding or a chamfer equal to 0.60, or less at the major diameter of the external th
24、reads. Figure 3 - Profiles for threads with clearance on the crest and on the flank Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking perm
25、itted without license from IHS -,-,- IS0 2901:1993(E) Table 2 - Dimensions for maximum material profiles Pitch P H4 = h, 1,5 0,15 0.9 2 0,25 I,25 3 0.25 1,75 4 0,25 2,25 5 0,25 2,75 6 or5 3,5 7 8 9 10 12 14 16 18 20 22 24 28 32 36 40 44 0,5 a5 0,5 0,5 0,5 1 1 1 1 1 1 1 1 1 1 1 4 4,5 5 5,5 6.5 8 9 10
26、 11 12 13 15 17 19 21 23 RI max. 0,075 0,125 0,125 0,125 0,125 0,25 0,25 0.25 0,25 0.25 0,25 0,5 0,5 or5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,5 R2 max 0,15 0,25 0,25 0,25 0,25 0,5 a5 0.5 0,5 0,5 0.5 1 1 1 1 1 1 1 1 1 1 1 Copyright International Organization for Standardization Provided by IHS under license
27、 with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 2901:1993(E) UDC 621.882.082.4 Descriptors: screw threads, IS0 metric threads, ACME threads, profiles, dimensions Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:55:47 MDTNo reproduction or networking permitted without license from IHS -,-,-