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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPTAHUSAUR l-l0 CTAHAAPTU3AL(UU Technical drawings - Tolerancing of linear and angular dimensions Dessins techniques - Tokrancernent de dimensions lin IS0 129, Technical d
2、rawings - Dimensioning - Generalprin- ciples, definitions, methods of execution and special indica- b) the tolerance symbbl. tions. IS0 3098-1, Technical drawings - Lettering rent b) the values of the deviations. +O,l w Figure 4 If one of the two deviations is zero, this should be expressed by the d
3、igit zero (see figure 5). k 32 -00,2 4 Figure 5 If the tolerance is symmetrical in relation to the basic size, the value of the deviations should be indicated once only, preceded by the sign f (see figure 6). w Figure 6 4.3 Limits of size The limits of size may be indicated by an upper and lower dim
4、ension (see figure 7). 32,198 32,195 I Figure 7 4.4 Limits of size in one direction If a dimension needs to be limited in one direction only, this should be indicated by adding “min.” or “max.” to the dimension (see figure 8). m Figure 6 5 Order of indication of deviations and limits of size The upp
5、er deviation 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. 2 Copyright International Organization for Standardization Provided by IHS under license w
6、ith ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 08:41:00 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 406 : 1987 (El 6 Indication of tolerances on drawings of assembled parts 6.1 IS0 symbols The tolerance symbol for the hole shall be
7、 placed before that for the shaft (see figure 9) or above it (see figure 101, the symbols being preceded by the basic size indicated once only. I2 H7/h6 4 H7 I2 h6 4 Figure 9 Figure 10 If it is also necessary to specify the numerical values of the deviations, they should be written in parentheses (s
8、ee figure II). Figure 11 For the sake of simplicity (notwithstanding IS0 1291, dimensioning with only one dimension line may be used (see figure 12). 6.2 Values by digits The dimension for each of the components of the assembled parts shall be preceded by the name (see figure 12) or item reference (
9、see figure 13) of the components, the dimension for the hole being placed in both cases above that for the shaft. I +0,3 hole 030 + 0,l - 0,l shaft 30 -0,Z +0,3 I30 +O,l -0,l 23o -0,2 Figure 12 Figure 13 3 Copyright International Organization for Standardization Provided by IHS under license with IS
10、O Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 08:41:00 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 406 : 1987 (E) 7 Indication of the components of an angular dimension The rules given for the indication of tolerances on linear dimensio
11、ns are equally applicable to angular dimensions, except that the units of the basic angle and the fractions thereof, as well as the deviations, shall always be indicated (see figures 14 to 17). If the angular deviation is expressed in either minutes of a degree or seconds of a minute of a degree, th
12、e value of the minute or second shall be preceded by O” or OOO, as applicable. A +0015“ 30“ -0OO 30” Figure 14 Figure 16 60“100“030“ v Figure 15 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resa
13、le, 04/27/2007 08:41:00 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 406 : 1967 (E) UDC 744.43 : 621.763.1 : 003.62 Descriptors : drawings, technical drawings, dimensioning, dimensional tolerances, angular tolerances, designation. Price based on 4 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 08:41:00 MDTNo reproduction or networking permitted without license from IHS -,-,-