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1、INTERNATIONAL STANDARD 237 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXflYHAPOAHAJT OPTAHM3AUMR II0 CTAHiIAPTW3AUMA .ORGANISATION ,NTERNAT,ONALE DE NORMALlSATlON Rotating tools with parallel shanks - Diameters of shanks and sizes of driving squares Outils tournants B queue cylindrique - DiamSt
2、res des queues et dimensions des carrk dentrainement First edition - 1975-02-01 UDC 621.9.02 Descriptors : tools, shanks, parallel shanks, driving squares, dimensions, diameters. Ref. No. IS0 237-1975 (E) Price based on 5 pages FOREWORD IS0 (the International Organization for Standardization) is a w
3、orldwide federation of national standards institutes (IS0 Member Bodies). The work of developing International Standards is carried out through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that
4、Committee. International 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 approval before their acceptance as International Standards by the IS0
5、 Council. Prior to 1972, the results of the work of the Technical Committees were published as IS0 Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technical Committee lSO/TC 29 has reviewed IS0 Recommendation R 237 a
6、nd found it technically suitable for transformation. International Standard IS0 237 therefore replaces IS0 Recommendation R 237-1961 to which it is technically identical. IS0 Recommendation R 237 was approved by the Member Bodies of the following countries : Austria India Belgium Italy Czechoslovaki
7、a Mexico France Netherlands Germany Pakistan Greece Poland Hungary Portugal Romania Sweden Switzerland United Kingdom U.S.S.R. The Member Body of the following country expressed disapproval of the Recommendation on technical grounds : U.S.A. The Member Body of the following country disapproved the t
8、ransformation of ISO/R 237 into an International Standard : Austria 0 International Organization for Standardization, 1975 ? Printed in Switzerland INTERNATIONAL STANDARD IS0 237-1975 (E) Rotating tools with parallel shanks - Diameters of shanks and sizes of driving squares 1 SCOPE AND FIELD OF APPL
9、ICATION 2 PREFERRED DIAMETERS This International Standard lays down the shank diameters and driving square sizes for rotating tools with parallel shanks, such as reamers, screwing taps, etc. It comprises two series of dimensions, a principal series and a secondary series, and gives for each of them
10、the dimensions in millimetres and the corresponding dimensions in inches. In each of the two series, the dimensions of driving squares for a given shank diameter are shown. The complete range of diameters is divided into a certain number of diameter steps, for each of which the corresponding standar
11、d square is given either in the principal series, or in the secondary series for use in cases where a finer subdivision is absolutely necessary in the small diameters. In the metric tables, the values of the across flats a of the squares and the preferred diameters d are scaled in accordance with th
12、e R20 series of preferred numbers; the limits of the diameter steps are the intermediate values of the R40 series of preferred numbers. In the inch tables, the values a and dare exact conversions of the corresponding metric values, expressed to three decimal places for the squares and to four decima
13、l places for the diameters. Millimetres Inches 1,12 11,2 0.044 1 0.440 9 1,25 12,5 0.049 2 0.492 1 1,40 14,0 0.055 1 0.551 2 1,60 16,0 0.063 0 0.629 9 1,80 18,0 0.070 9 0.708 7 2,00 20,o 0.078 7 0.787 4 2,24 22,4 0.088 2 0.881 9 2,50 25,O 0.098 4 0.984 2 2,80 28,0 0.110 2 1.102 4 3,15 31,5 0.124 0 1
14、.240 2 3,55 35,5 0.139 8 1.397 6 4,00 40,o 0.157 5 1.574 8 4,50 45,o 0.177 2 1.771 7 5,oo 50,o 0.196 9 1.968 5 5,60 56,O 0.220 5 2.204 7 6,30 63,0 0.248 0 2.480 3 7,lO 71,0 0.279 5 2.795 3 8,00 80,O 0.315 0 3.149 6 9,00 90,o 0.354 3 3.543 3 10,oo 100.0 0.393 7 3.937 0 In the principal series, the ta
15、bles give not only the two limits for each diameter step, but in addition, for each step, the value of the preferred diameter (see list below), which corresponds to the theoretical optimum ratio a/d = 0,BO between the across flats of the square and the diameter of the shank. 3 INTERCHANGEABILITY Wit
16、hin any given step, this ratio a/d varies between the extreme limits 0.75 and 0.85 for the principal series, and 0,80 and 0,85 for the secondary series, taking account of the nominal values of a and d only. If the tolerances on a and dare taken into account, it never falls below 0,72, even in the wo
17、rst cases. The dimensions in millimetres and in inches have been determined in such a way as to ensure that the squares corresponding to a given diameter step are identical, whether expressed in millimetres or in inches. Furthermore, the limits of the diameter steps correspond exactly, so that two d
18、iameters, whether in millimetres or in inches, belonging to the same diameter range have the same driving square. 1 -,-,- IS0 237-1975 (E) 4 SHANK DIAMETERS AND DRIVING SQUARES 4.1 Principal series 4.1.1 Dimensions in millime tres + 6+ 8 Centre Alternative form (for small diameters) ? ? cwcr 7 incl.
19、 1,06 1,18 0,90 1,12 lo,60 11,80 9,00 12 11,20 _ 1,18 1,32 1,OO 1,25 11,80 13,20 -1,50 1,32 1,12 .- io,oo - 13 12,50 w 13,20 15,00 11,20 14 14,00 _ _ - _-. _-. 1,50 1,70 1,25 1,60 15,00 17,00 12,50 16 16,OO -I- 4 - - 1,70 1,90 1,40 1,80 17,00 19,00 14,00 18 18,OO - _- 1,90 2,12 1,60 2m 19,00 21,20 1
20、6,00 20 20,OO _- . 2,12 / 2,36 1,80 2,24 21,20 23,60 18,00 / 22 22,40 _-. -. .- 2,36 2,65 2,00 2,50 23,60 26,50 / 20,OO 24 25,00 _ _ - _- -_ 2,65 3,00 2,24 2,80 26,50 30,OO 22,40 26 28,00 -_ 3300 3,35 2,50 5 3,15 30,OO 33,50 25,00 28 31,50 - -335 3,75 2,80 -_ - -I- - 3,55 33,50 37,50 28,00 31 35,50
21、_- - 3,75 4,25 3,15 6 4300 37,50 42,50 31,50 34 40,oo _- 4,25 4,75 3,55 4,50 42,50 47,50 35,50 38 45,00 _-_ 4,75 I 5,30 4,00 - _-.- 7 5,00 47,50 53,00 40,OO 42 50,OO 5,30 6,00- i 2) on dimension a of the internal square intended to accept the tool shank : 011; 3) on the shank : for precision tools :
22、 h9, for other tools : hll. For dimensions in inches, direct conversion into inches of the metric values of the tolerances h9, hl 1, h12 and Dl 1. ? From among a number of possible diameters in e particular step, choose the value nearest to the preferred value (see the last column of the table). 3 -
23、,-,- 1so237-1975 (El 4.2 Secondary series (to be avoided wherever possible) 4.2.1 Dimensions in millimetres Shank diameter ? Driving square Shank diameter* d d Driving square over incl. a 1 z, over / incl. a I L I,06 i 1,12 0,90 3,35 3,55 2,80 5 1,12 1,18 0,95 3,55 3,75 3,OO 1,18 1,25 1 ,oo 3,75 4,O
24、O 3,15 1,25 1,32 1,06 4,00 4,25 3,35 1,32 1,40- 6 1,12 4,25 4,50 3,55 1940 1,50 1,18 4,50 4,75 3,75 1,50 1,60 1,25 4,75 5300 4300 1,60 -1,70 1,32 5m 5,30 4,25 7 1,70 1,80 1,40 4 5,30 5,60 4,50 1,80 -1,90 1,50 5,60 6,oojir 4,75 1,90 2,00 1,60 6,00 6,30 5300 - 2900 2,12 1,70 6,30 6,70 5,30 8 2,12 2,24
25、 1,80 6,70 7,lO 5,60 2,24 2,36 1,90 7,lO 7,50 6,00 2,36 2,50 2, 7,50 8, 6,30 - 9 2,50 2,65 -ii- 8, 8,50 6,70 2,65 2,80 2,24 8,50 9900 7,lO 2,80 3200 2,36 5 gm 10 9,50 7,50 _- 3300 3,15 2,50 3,15 3,35 2,65 ? From among a number of possible diameters in a particular step, choose in preference the valu
26、e nearest to the upper limit of the step. 4 -,-,- IS0 237-1975 (El 4.2.2 Dimensions in inches Shank diameter* d Driviwwu.re II skulk diameter* d Driviagsqure over incl. a 1 I, over I incl. a I 14 0.0417 0.044 1 0.035 0.131 9 0.139 8 0.110 0.044 1 0.046 5 0.037 0.139 8 0.147 6 0.118 a/l6 - 0.046 5 0.
27、049 2 0.039 0.147 6 0.157 5 0.124 - 0.049 2 0.052 0 0.042 0.157 5 0.167 3 0.132 - 0.052 0 0.055 1 0.044 0.167 3 0.177 2 0.140 l/d 0.055 1 0.059 1 0.046 0.177 2 0.187 0 0.148 0.059 1 0.063 0 0.049- 0.187 d- 0.196 9 0.157 0.063 0 0.066 9 0.052 0.196 9 0.208 7 0.167 _ 0.066 9 o.0709 0.055 =I32 0.208 7
28、0.220 5 0.177 Ysa - 0.070 9 0.074 8 0.059 0.220 5 0.236 2 -GE- 0.074 8 0.078 7 0.063 0.236 2 0.248 0 0.197 -_ _- 0.078 7 0.083 5 0.067 0.248 0 0.263 8 0.209 0.083 5- _-_ 0.088 2 0.071 0.263 8 0.279 5 0.220 Yrs 0.088 2 0.092 9 0.075 0.279 5 0.295 3 0.236 0.092 9 0.098 4 0.079 0.295 3 0.315 0 0.248 -
29、11 0.098 4 0.1043 0.083 0.315 0 0.334 6 0.264 I 88 - 0.104 3 0.110 2 0.088 0.334 6 0.354 3 0.280 1g 0.110 2 0.118 1 0.093 0.354 3 0.374 0 0.295 I 88 0.118 1 0.124 0 0.098 sllS - - 0.124 0 0.131 9 0.104 ? From among a number of possible diameters in a particular step, choose in preference the value nearest to the upper limit of the step. 5 -,-,-