1、UDC 744.43 : 621.71 3.1 DEUTSCHE NORM December 1992 Engineering drawing practice Dimensioning Tolerancing of linear and angular dimensions (modified version of IS0 406 : 1987) DIN 406 Part 12 /n keeping with current practice in standards published by the International Organization for Standardizatio
2、n (ISO), a comma has been used throughout as the decimal marker. IS0 129 I IS0 3098-1 Dimensions in mm DIN 406 Parts 10 and 11 DIN 6776 Part 1 This standard incorporates the text of International Standard IS0 406 : 1987 Technical drawings; tolerancing of linear and angular dimensions, with modificat
3、ions introduced by the German national standards committee (cf. Explanatory notes). This standard comprises the specifications of IS0 406 : 1987 and supplementary specifications required to take account of advances in drawing techniques (e.g. computer-assisted design) and due for submission to ISOIT
4、C 10 for inclusion in the next revision of IS0 129 and IS0 406. These supplementary specifications are shown shaded. The numbering of the figures corresponds to that in IS0 406. New figures serving to illustrate the supplementary specifications have been placed at the appropriate points in the text,
5、 but they have been numbered so as to follow on from the numbers in IS0 406. The DIN Standards corresponding to the IS0 Standards referred to in clause 2 are as follows: I IS0 Standard I DIN Standard I Foreword IS0 (the International Organization for Standardization) is a worldwide federation of nat
6、ional 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 represented on that committee. Interna
7、tional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publica- tion as an International Standard requires approval by least 75 % of th
8、e member bodies casting a vote. International Standard IS0 406 was prepared by Technical Committee ISOITC 10, Technical drawings. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its l
9、atest edition, unless otherwise stated. Continued on pages 2 to 5 muth Verlag GrnbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). D/N 406 Part 72 End. Price arouL) 03.94 - -. Sales No.0107 Page 2 DIN 406 Part 12 O Introduction For the purposes of this International Stan
10、dard, all dimensions and tolerances on the drawings have been sten- cilled in upright lettering. It should be understood that these indications could just as weil be written in free-hand or inclined (italic) lettering without altering the meaning of the indications. For the presentation of lettering
11、 (proportions and dimensions), see IS0 3098-1. 1 Scope and field of application This International Standards specifies the indication of tolerances for linear and angular dimensions on technical drawings. Indicating such tolerances does not necessarily imply the use of any particular method of produ
12、ction, measurement or gauging. 2 References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agree- ments base
13、d on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 main- tain registers of currently valid International Standards. IS0 129 : 1985 Technical drawings; dimensioning, gen- eral principles, defin
14、itions, methods of execution and special indications IS0 3098-1 : 1974 Technical drawings; lettering; currently used characters. 3 Units Deviations shall be expressed in the same unit as the nominal size. If two deviations relating to the same dimension have to be shown, both shall be expressed to t
15、he same number of decimal places (see figure 2), except if one of the deviations is zero (see figure 5). 4 Indication of the components of a linear dimension Part 1). 4.1 The components of a toleranced dimension shall be indicated in the following order: a) the nominal size; b) the tolerance symbol.
16、 Tolerance classes as specified in IS0 286-1 If, in addition to the symbols (see figure I), it is necessary to express the values of the deviations (see figure2) or the limits of size (see figure 3), the additional information shall be shown in Darentheses. speciiecd, Figure 1 Figure 2 Figure 3 Figu
17、re 19 4.2 Limit deviations The components of a toleranced dimension shall be indicated in the following order (see figures 4 to 6): a) the nominal size; b) the values of the deviations. Figure 4 If one of the two deviations is zero, this may be expressed by the digit zero (see figure 5). 32-0,2 vi F
18、igure 5 DIN 406 Part 12 Page 3 If the tolerance is symmetrical in relation to the nominal size, the value of the deviations shall be indicated once only, preceded by the sign f (see figure 6). 32201 H Figure 6 4.3 Limits of size The limits of size may be indicated by an upper and lower dimension (se
19、e figure 7). 32,198 32,195 H Figure 7 4.4 Limits of size in one direction If a dimension needs to be limited in one direction only, this may be indicated by adding min. or max. to the dimension fsee fiaure 8). 30,s min. H Figure 8 5 Order of indication of deviations and limits of size The upper devi
20、ation or the upper limit of size shall be written in the upper position and the lower deviation or the lower limit of size in the lower position, irrespective of whether a hole or a shaft is toleranced. 6 Indication of tolerances on drawings of assembled parts 6.1 Symbols of tolerance class The tole
21、rance symbol for the hole shall be placed before that for the shaft (see figure 9) or above it (see figure IO), the symbols being preceded by the nominal size indicated once only. 20 and 21. B 012 H71 h6 012 h6 Figure 9 Figure 10 If it is also necessary to specify the values of the devia- in parenth
22、eses (see figure 11) Figure 11 For the sake of simplicity (notwithstanding IS0 129), dimensioning with only one dimension line may be used 6.2 Limit deviations The dimension for each of the components of the assembled parts shall be preceded by the name (see figure 12) or item reference) (see figure
23、 13), the dimension for the hole being placed in both cases above that for the shaft. -0.1 -0.1 Outer 030-0.2 2 030- 0.2 Figure 12 Figure 13 1) National footnote: Cf. IS0 6433. Page 4 DIN 406 Part 12 7 Indication of the components of an angular dimension The rules given for the indication of toleran
24、ces on linear dimensions are equally applicable to angular dimensions (see figures 14 and 15), except that the units of the basic angle and the fractions thereof, as well as the deviations, ed (see figures 14 to 17). If the angular deviation is ex either minutes of a degree or seconds of a minute of
25、 a degree, the value of the minute or second shall be preceded by 00 or 00 O, as applicable. 60 O10 i 00 30“ + O0015“ 300-000“ A Figure 14 v Figure 15 Figure 16 Figure 17 , it may be DIN 406 Pari 12 Page 5 Standards referred to See clause 2 for standards referred to in IS0 406. DIN 406 Part 1 O DIN
26、406 Part 1 1 DIN 6776 Part 1 DIN 71 86 Part 1 DIN 50 960 Part 1 IS0 129 : 1985 IS0 286-1 : 1988 IS0 406 : 1987 IS0 3098-1 : 1974 IS0 6433 : 1981 Engineering drawing practice; dimensioning; concepts and general principles Engineering drawing practice; dimensioning; principles of application Technical
27、 drawings; lettering; characters Statistical tolerancing; concepts, application and indications on drawings Electroplated and chemically applied coatings; indications on drawings Technical drawings; dimensioning; general, definitions, methods of execution and special indications IS0 system of limits
28、 and fits; bases of tolerances, deviations and fits Technical drawings; tolerancing of linear and angular dimensions Technical drawings; lettering; currently used characters Technical drawings; item references Other relevant DIN 199 Part 1 DIN 7182 Part 1 IS0 1101 : i983 IS0 1660 : 1987 IS0 2768-1 :
29、 1989 IS0 3040 : 1990 IS0 5458 : 1987 IS0 5459 : 1981 IS0 8015 : 1985 standards Terminology associated with drawings and parts lists; drawings Sizes, deviations, tolerances and fits; basic concepts Technical drawings; geometrical tolerancing; tolerancing of form, orientation, location and run-out; g
30、en- eralities, definitions, symbols, indications on drawings Technical drawings; dimensioning and tolerancing of profiles Tolerances for linear and angular dimensions without individual tolerance indications Technical drawings; dimensioning and tolerancing; cones Technical drawings; geometrical tole
31、rancing; positional tolerancing Technical drawings; geometrical tolerancing; datums and datum systems for geometrical tolerances Technical drawings; fundamental tolerancing principie Previous editions DIN 406 Parts 1 to 3: 12.22; DIN 406 Part 4: 12.22,05.37; DIN 406 Part 5: 11.24,10.41; DIN 406 Part
32、 6: 12.24,Ol.26,10.41; DIN 406: 09.49,09.55; DIN 406 Part 2: 06.68,04.80, 08.81. Amendments The following amendments have been made to the August 1981 edition of DIN 406 Part 2. a) A modified version of IS0 406 has been incorporated. b) It has been specified that deviations are to be written in figu
33、res of the same size as those used for the nominal sizes. c) Parts of clauses 16 and 17 of DIN 406 Part 2, August 1961 edition have been included. d) The presentation of the standard has been reorganized. Explanatory notes International Standard IS0 406 was prepared by ISOITC 10ISC 5, with significa
34、nt input from the German experts participating. Following the publication of draft DIN IS0 406 in December 1986, the national standpoint on future developments was dis- cussed, with the result that it was decided to include in this standard relevant specifications previously made in DIN 406 Pari 2. International Patent Classification GO1 B
