1、DEUTSCHE NORM November 199 IS0 general purpose metric screw threads (IS0 261 : 1998) General plan DIN - IS0 261 ICs 21.040.1 O Supersedes DIN 13-1 2, October 1988 edition, and Supplement to DIN 13-1 2, November 1975 edition. Metrisches ISO-Gewinde allgemeiner Anwendung - bersicht (IS0 261 : 1998) Th
2、is standard incorporates International Standard IS0 261 IS0 general purpose metric screw threads - General plan. A comma is used as the decimal marker. National foreword This standard has been prepared by ISO/TC 1. The responsible German body involved in its preparation was the Normenausschu Technis
3、che Grundlagen (Fundamentals in Technology Standards Committee). The DIN Standards corresponding to the International Standards referred to in clause 2 of the IS0 Standard are as follows: IS0 Standard DIN Standard IS0 262 DIN IS0 262 IS0 724 DIN IS0 724 IS0 5408 DIN 2244 IS0 68-1 DIN IS0 68-1 IS0 96
4、5-1 DIN IS0 965-1 Amendments DIN 13-1 2, October 1988 edition, and Supplement to DIN 13-1 2, November 1975 edition, have been super- seded by the specifications of DIN IS0 261. Previous editions 1969-09, 1975-1 1, 1988-1 O; Supplement to DIN 13-1 2: 1968-1 1, 1975-1 1. DIN 243-1 : 1923-02; DIN 243-2
5、: 1923-02; DIN 243-3: 1923-02; DIN 243: 1943-09; DIN 13-1 2: 1952-01, National Annex NA Standards referred to (and not included in Normative references) DIN 2244 Screw threads - Terminology DIN IS0 68-1 IS0 general purpose screw threads - Basic profile - Part 1 : Metric screw threads DIN IS0 262 IS0
6、 general purpose metric screw threads - Selected sizes for screws, bolts and nuts (IS0 262 : 1998) DIN IS0 724 IS0 general purpose metric screw threads - Basic dimensions (IS0 724 : 1993) DIN IS0 965-1 IS0 general purpose metric screw threads -Tolerances - Part 1 : Principles and basic data (IS0 68-
7、1 : 1998) (IS0 965-1 : 1998) IS0 Standard comprises 5 pages. Q No part of this standard may be reproduced without the prior permission of Ref. No. DIN IS0 261 : 1999-1 1 DIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, D-i0772 Berlin, has the exclusive right of sale for German Sta
8、ndards (DIN-Normen). English price group 07 Sales No. 0407 04.00 Page 1 IS0 261 : 1998 IS0 general purpose metric screw threads General plan Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of prepa
9、ring 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 represented on that committee. International organizations, governmental and non-governmental, in l
10、iaison 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 adopted by the technical committees are circulated to the member bodies for voting. Publica
11、tion as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 261 was prepared by Technical Committee ISOTTC 1, Screw threads, Subcommittee SC 1, Basic data. This second edition cancels and replaces the first edition (IS0 261 :19
12、73) which has been technically revised. 1 Scope This International Standard specifies IS0 general purpose metric screw threads (M) having basic profile according to IS0 68-1. Basic dimensions are given in IS0 724. For tolerances see IS0 965-1. 2 Normative references The following standards contain p
13、rovisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate th
14、e possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 68-1 :1998, IS0 general purpose screw threads - Basic profile - Part 7: Metric screw threads. IS0 262:1998, IS0 general purpo
15、se metric screw threads - Selected sizes for screws, bolts and nuts. IS0 724: 1 993, IS0 general purpose metric screw threads - Basic dimensions. IS0 965-1 :1998, IS0 general purpose metric screw threads - Tolerances - Part 7: Principles and basic data. IS0 5408: 1 983, Cylindrical screw threads - V
16、ocabulary. 3 Definitions For the purposes of this International Standard, the definitions given in IS0 5408 apply. 4 Designation A screw thread in conformity with this International Standard shall be designated according to IS0 965-1. Page 2 IS0 261 : 1998 2 3 5 Choice of diameter and pitch 200 300
17、5.1 Choose, for preference, diameters in column 1 of table 2 and, if necessary, in column 2 and then in column 3. Diameter 35 mm, and pitch 1,25 mrn of diameter 14 mm shall be used only for the special cases indicated in the footnotes. Pitches shown in parentheses are to be avoided as far as possibl
18、e. 5.2 The words “coarse“ and “fine“ are given in order to conform to usage. No concept of quality shall, however, be associated with these words. It shall be understood that the “coarse“ pitches are the largest metric pitches used in current practice. 5.3 For the diameter (or the diameter range) se
19、lected, choose one of the pitches shown on the corresponding line (or lines). 5.4 If screw threads finer than those appearing in table 2 are found necessary, only the following pitches shall be used: 3 mm; 2 rnm; 1,5 mm; 1 rnm; 0,751 mm; 0,5 mm; 0,35 mm; 0,25 mm; 0,2 mm When selecting such pitches,
20、take into account the fact that there is increasing difficulty in complying with tolerances as the diameter is increased for a given pitch. It is suggested, that diameters larger than those shown in table 1 should generally not be used with the pitches indicated. Table 1 - Maximum nominal diameter D
21、imensions in millirnetres Pitch Maximum nominal diameter 0,75 80 150 Page 3 IS0 261 : 1998 Table 2 - Nominal diametedpitch Dimensions in millimetres Pitch P fine 1,25 1 0,75 0,75 0,75 1 0,75 1 0,75 1,25 1 0,75 1 0,75 1,25 1 1,25 a 1 1 1 1 1 1 1 1 1 1 1 1 (continued Page 4 IS0 261 : 1998 Table 2 (con
22、tinued) (continued) Page 5 IS0 261 : 1998 Table 2 (concluded) Dimensions in millimetres I Col. 2 2nd choice 21 o 240 260 300 COI. 3 I coarse 3rd choice + 215 Col. 1 1 si choice 220 225 230 245 235 I 255 I i- l a Only for spark plugs for engines. Only for locking nuts for bearings. 8 8 a a 8 a 8 Pitch P fine
