!"#$%&#'(%) Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “7"#1 &" 8+9&"), 7:1 &" 8+9&")” “The Right to Information, The Right to Live” Mazdoor Kisan Shakti Sangathan “/0)"1 &2 324 #' 5 *)6” “Step Out From the Old to the New” Jawaharlal Nehru IS 2102-1 (1993): General tolerances, Part 1: Tolerances for linear and angular dimensions without individual tolerance indications [PGD 20: Engineering Standards] “Invent a New India Using Knowledge” “!"# $ %& #' (")* &" +#,-.” Satyanarayan Gangaram Pitroda “!"# %& ;<" =7"#" > 72 &(: ?0)"@" #AB 7" <&*" A” * “Knowledge is such a treasure which cannot be stolen” Bhart+hari—N,ti-atakam . . IS0 IS 2102 ( Part 1 .) : 1993 2768-l : 1989 ( Reaffirmed 2003 ) UDC 621’753’1 : 744’4 @ BIS 1993 iBUik@AlJ Of INDIAN hk4W4ft $Ha4VhW.9 BAHADUR NEW OELHL STANDARDS SHAH 110002 ZAFAR MARG . external sizes.IS 2102 ( Part 1) : 1993 IS0 2768-l : 1989 Indian Standard GENERAL PART 1 TOLERANCES WITHOUT TOLERANCES FOR LINEAR AND ANGULAR DIMENSIONS INDIVIDUAL TOLERANCE INDICATIONS ( Third Revision ) 1 Scope 2 General This part of IS0 2758 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes.System of dimensional tolerances. 3 Normative references The following standards contain provisions which. the larger of the two general tolerances in question applies. 1) IS0 8062 : 1904. radii. cl linear and angular dimensions produced by machining assembled parts. for which no individual tolerance is directly indicated. Fundamental toleran- IS0 8015 : 1985. external radii and chamfer heights for broken edges). 4 4. . such tolerances should be indicated adjacent to the relevant nominal dimension(s). constitute provisions of this part of IS0 2768. This part of IS0 2758 only applies for the following dimensions which do not have an individual tolerance indication : a) linear dimensions (e. When selecting the tolerance class. IS0 2758-Z : 1989. General tolerances for linear dimensions are given in tables 1 and 2. diameters. the respective customary workshop accuracy has to be taken into consideration.linear and angular dimensions apply when drawings or associated specifications refer to this part of IS0 2768 in accordance with clauses 4 and 5.g. It does not apply for the following dimensions : a) linear and angular dimensions which are covered by reference to other standards on general tolerances.g. Castings . and parties to agreements based on this part of IS0 2768 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. It applies to the dimensions of parts that are produced by metal removal or parts that are formed from sheet metal. see IS0 60621)for castings. b) angular dimensions. NOTE 1 . e.g. e. distances. including angular dimensions usually not indicated.The conceptsbehind the generaltolerancingof linearand angulardimensions are describedin annex A. internal sizes. see IS0 806211.g. NOTES 2 Thesetolerancesmay be suitablefor use with materialsother than metal. General tolerances for . e. or angles of uniform pclygons.1 General tolerances Linear dimensions c) theoretically exact dimensions indicated in rectangular frames. e. b) auxiliary dimensions indicated in brackets. General tolerances tolerances for features without individual Part 2: Geometrical tolerance indications. of cast or forged parts. If smaller tolerances are required or larger tolerances are permissible and more economical for any individual feature. 3 Parallel International Standards exist or are planned. Technical drawings cing principle. reference shall be made to them on the drawings or associated specifications. unless reference to IS0 2768-2 is made. If there are general tolerances for other processes. All standards are subject to revision. for castings. For a dimension between an unfinished and a finished surface. the editions indicated were valid. Members of IEC and IS0 maintain registers of currently valid International Standards. At the time of publication. right angles BOoI. as specified in other International Standards. through reference in this text. step sizes.g. The maximum of the line derived from the actual surline of ideal geometrical the contacting line and 8015).15 +0.very coarse -__+ 30 It 090 220 +1o kOO15’ k OY?O’ ltOOl0 f 0020’ 2 . only the but not a) b) IS0 “IS0 the 2768. EXAMPLE The general orientation face is the orientation form.5 mm.2 - k 0.3 f0.05 f0.4).2 Angular dimensions specified in angular units control of surfaces.1 +_ 0.3 kO.5 +1. workpieces to function exceeding is not the general (see Unless 5 Indications on drawings in accordance with this part of IS0 shall be indicated 2768 in or information tolerance ability shall not lead to automatic workpiece rejection provided that the impaired If general tolerances clause A.8 +1.4 very +1 +2 coarse 1) For nominal sizes below 0.05 fO. Table 3 Tolerance Designation f m C V Permissible deviations of angular dimensions for ranges of lengths. 2768”.5 400 f 0.5” up to 3 deviations over 3 radii and chamfer heights) Values in millimetres Tolerance Designation ---__ f m _~ -___.2 kO. in millimetres.2 f2. the deviations shall be indicated adjacent to the relevant nominal size(s). the following near the title block : Table 1 - Permissible deviations for linear dimensions heights.5 loo0 *0. except for broken edges Values in millimetres (external radii and chamfer see table 2) Tolerance I class n c11 Description Permissible deviations over 1 for basic size range over 1 over ) over 1 1 over 1 over 1 over I Designation I 6 f m C V 36 f0. shall apply. the deviations shall be indicated adjacent to the relevant nominal size(s).5 coarse 1) For nominal sizes below 0.1 f 0. over 4lXl + 005 class Description fine medium up to 10 f10 Permissible deviations of the shorter side of the angle concerned over 10 up to 56 + 0030’ over 56 up to 120 over 120 up to 406 + 0020 + 0010’ ~____ coarse -. Table 2 - Permissible class deviations for broken edges (external Permissible 0.l + 0.3 f0.5 kl 126 kO.5 mm. deviations of angular dimensions are given in 6 Rejection otherwise of the stated.8 f2 f4 2066 kO.IS 2102 IS0 ( Part 1) : 1993 2766-l : 1969 4.5 f 0. tolerance class in accordance with this part of General tolerances general orientation of lines or line elements their form deviations.2 +0.5 -L 1.2 +3 +6 46cm *2 +4 +_8 fine medium coarse very i 0. IS0 2768-m between of the contacting distance the actual line shall be the least possible value (see IS0 The permissible table 3. C V for basic size range Description up to 6 over 6 fl / fine I / medium coarse * 0.2 +0. economy. Relying on undefined concept of general tolerances “good workmanship” with all its uncerThe general of “good In these special cases. the customary workshop accuracy of the is equal to or finer than the general in the drawing. New Dclbi. made more effective b) the design A. ling features tolerances will. saves time by avoiding deis workmanship”. tolerance should be of no benefit in this particular *0. geometrical define A. for the most pat-t. However. the larger tolerance to the dimension should be indicated for the particular feature. India . in- those dimensions which have individually classes tolerance cording customary appropriate dicated tolerances. workshop accept accuracy allows full use of the concept only those drawings There will be “exceptions feature allows and the larger tolerance individually adjacent to the rule” where the function than the general manufacturing will provide of the equal to or greater - than its customary a larger tolerance tolerances.1 by General reference tolerances to this part should be indicated of IS0 2768 on the drawing with c) the drawing readily indicates which feature process capability.e. This type of of general tolerancing. BIS. accuwhat its customary falls outside the scope of general tolerances.3 tages a) Using general tolerances leads to the following advan- geometrical : drawings are easier to read and thus communication to the user of the drawing. tured a feature to a high having a 35 mm diameter of conformance accuracy”. out by to or larger tolerance values. having general workshop tolerances accuracy. than not the general tolerance. values of Specifying supply since engineers the can in a workshop negotiate workshop orders accuracy” “customary is placed. For e) purchase and sub-contract more readily could be manufacwith of as a tolerance workshop. tainties and misunderstandings is no longer necessary with the tolerances. be those controlrequires relatively small planmay require special effort in services in their analysis class being selected and indicated to the requirement on the drawing for which the function - for the components. The values of of general tolerances workshop correspond accuracy.’ when workshop indicated are fully that the obtained only when there is general tolerances will not be have the smaller cent to the dimension tolerance its size or angle. general tolerance should lead to a rejection only if the function is impaired.IS 2102 ( Part 1) : 1993 IS0 2768-l : 1989 Annex A (informative) Concepts behind general tolerancing of linear and angular dimensions A.g. Rrprogr*phy Unit. which by reducing remaining. would of inspection requirements. the required accuracy e. indicated tolerance requires a smaller then that feature individually adjaThis type of value than the “general defining These advantages sufficient reliability exceeded. by enlarging in manufacturing example. a feature tolerances”. be quite since in this respect the drawing if. there is usually no gain the tolerance. the buyer is com- “customary the general medium tolerance is known before the contract on delivery between k 1 mm would adequate. the depth of blind holes drilled at assembly. therefore measurements is. should not be indicated be stated on the drawing tolerance adjacent to the dimension as described in clause 5. and which therefore the production this will be helpful for production A.2 ning and will assist quality control Above certain tolerance economy level values. the to tolerance ac- quality engineering d) levels. the function than the of a feature general allows a tolerance these but should In cases where equal The workshop find should. particular tolerances i. inspection can be proalso assists in accordance duced by normal clause 5.4 The tolerance the function The function allows is often greater of the part is. is ioccasiorlallv) Exceeding the of the workpiece allows a tolerance greater than or equal to the general tolerance. therefore.3 mm this also avoids arguments and the supplier. check by sampling that its customary workshop racy does not deteriorate. draughtsman calculations tailed tolerance that the function as it is sufficient only to know always impaired when the general tolerance exceeded at any feature of the workpiece. for functional reasons. plete. established under the Bureau of Indian Stunt.T. : 91. marking‘and quality certifidation of goods and attending to connected matters in the country.Bureau of Indian Standards BIS is a statutory institution . 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Telegrams: Manaksanstha (Common to all offices) T&phone 323 76 17.P.3843 ( bbEjb25 : : C. it is taken up for revision.323 33 75.I. in the course of implementing the standard. This Indian Standard has been developed from Dot: No. basis of comments. IV Cross Road.832 78 it3 5g bE ( 832 832 92 78 95. 1986 to promote harmonious development of the activities of standardization.T. Maniktola CALCUiTA 7bOO54 SC0 335-336. Enquiries relating to copyright be addressed to the Director (Publication).337 : bb. V. No part of these publi&tions may be reproduced in any form without the prior permission in writing of BIS.235 $35 b4 23 4i i5 { 23s 235 02 15 16. Standards are also reviewed periodically. Road. Date of Issue Text Affected BUREAU OF INDIAN STANDARDS Headquarters: Manak Bhavan. This does not preclude the free use.