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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEYDHAPO“AR 0PFAHMJA”HIl I,0 CTAHAPTH3AL,CIH.ORGAN,SAT,ON ,NTERNAT,ONALE DE NORMAL,SAT,ON Reduction sleeves and extension sockets for tools with Morse taper shanks Douilles de rbduction et allonges pour outiis au C these document
2、s are now in the process of being transformed into International Standards. As part of this process, Technical Committee ISO/TC 29 has reviewed IS0 Recommendation R 238 and found it technically suitable for transformation. International Standard IS0 238 therefore replaces IS0 Recommendation R 238-19
3、61 to which it is technically identical. IS0 Recommendation R 238 was approved by the Member Bodies of the following countries : Belgium India Czechoslovakia Italy France Mexico Germany Netherlands Greece Pakistan Hungary Poland Portugal Romania Sweden Switzerland United Kingdom U.S.S.R. The Member
4、Body of the following country expressed disapproval of the Recommendation on technical grounds : U.S.A. No Member Body disapproved the transformation of ISO/R 238 into an International Standard. 0 International Organization for Standardization, 1974 ? Printed in Switzerland INTERNATIONAL STANDARD IS
5、0 238-1974 (El Reduction sleeves and extension sockets for tools with Morse taper shanks 1 SCOPE AND FIELD OF APPLICATION This International Standard lays down the dimensions of the following two pieces of equipment : 1) reduction sleeves for tools with Morse taper shanks; 2) extension sockets for t
6、ools with Morse taper shanks. It comprises, for each of them, two tables giving respectively the dimensions in millimetres and the corresponding dimensions in inches. 2 INTERCHANGEABILITY The numerical values given, whether in millimetres or in inches, automatically ensure interchangeability with th
7、e corresponding machines and tools, whatever the system of units employed. The mating dimensions of the sleeves and sockets are in fact in accordance with those specified in IS0 296 for Morse taper shanks, which were determined so as to give the same guarantee of interchangeability. 2.1 Reduction sl
8、eeves In the reduction sleeves in millimetres and in inches, the inside taper is always strictly the same as the standard Morse taper of the same number, even in its length. The same applies to the outside taper, except for the length, however, which is sometimes equal to, sometimes greater than, th
9、at of the standard taper of the same number. 2.2 Extension sockets The statements made above concerning the Morse taper dimensions of the reduction sleeves are equally applicable to the extension sockets, under the same conditions. The tables in 4.1 and 4.2, in millimetres and in inches, also specif
10、y, for the latter, the diameter of the parallel portion and the minimum value for the total length /*. Lengths I, above this minimum should be selected to suit requirements, but preference should be given to multiples of 5 mm or l/4 inch, or even 10 mm or l/2 inch.) 1) This minimum will be either th
11、e minimum value shown in the tables or the slightly larger one indicated in the relevant note as “reinforced minimum”. 1 -,-,- IS0 238-1974 (E) 3 REDUCTION SLEEVES FOR TOOLS WITH MORSE TAPER SHANKS 3.1 Dimensions in millimetres Outside Morse taper -, ,- Inside Morse taper Example of the method of de
12、signating a reduction sleeve with outside Morse taper 4, and inside Morse taper 2 : Reduction sleeve Morse 4 X 2 The use of those sizes where the inside taper is shown in brackets should be avoided whenever possible. 2 -,-,- IS0 238-1974 (El 3.2 Dimensions in inches M.T. NO. 2 5 1.748 6 2.494 8/1, O
13、utside taper d I 0.700 0.938 1.231 3”/8 311.9 4Y* 41, 51, I, Inside taper M.T. NO. 4 11 I 1 3,i: 1 0.475 0.475 +a 11 I 16 2 0.700 (0 0.475 I4 2 0.700 Is 3 0.938 (1) 0.475 I4 (2) 0.700 . 3 0.938 The use of those sizes where the inside taper is shown in brackets should be avoided whenever possible. No
14、te relating to the tables in 3.1 and 3.2. Morse taper in accordance with IS0 296 dealing with self-holding tapers for tool shanks (except for the dimensions al and I which are greater for certain tools than the corresponding dimensionsa and 12 given in IS0 296). 3 IS0 238-1974 (E) 4 EXTENSION SOCKET
15、S FOR TOOLS WITH MORSE TAPER SHANKS 12 4 c 4 I b al Outside Morse ta I 4 D 12 4 c, Example of the method of designating an extension socket with outside Morse taper 4 and inside Morse taper 2 : 4.1 Dimensions in millimetres Extension so1; 1 12,065 1 20 200 I 31,267 1 128 / IO,5 2 17,780 30 215 3 23,
16、825 36 240 4 31,267 4 “%-I I (5) 44,399 63 (1) 12,065 20 232 I 695 (2) 17,780 30 247 3 23,825 36 268 4 31,267 48 13,5 300 5 44.399 63 335 (1) 121065 20 294 (2) 17,780 30 309 8 (3) 23,825 36 330 . I 4 31,267 48 355 5 44,399 63 390 The use of those sizes where the inside taper is shown in brackets sho
17、uld be avoided whenever possible. ? See note 1, in 4.2. 4 -,-,- IS0 238-1974 (E) 4.2 Dimensions in inches Outside taper I 5 1.748 2.480 The use of those sizes where the inside taper is shown in brackets should be avoided whenever possible. ? See note 1, below. Notes relating to the tables in 4.1 and
18、 4.2. 1 Minimum length The minimum shown for 12 is the normal. The minimum described as “reinforced” comprises the same values, increased as follows : 5 mm or l/4 in for extension sockets with inside tapers 1 to 3, 10 mm or l/2 in for those with inside tapers 4 and 5. For the choice of length 12 abo
19、ve the minimum shown above, give preference, to suit requirements, to lengths in multiples of 5mmor1/4in 10 mm or l/2 in 2 Morse tapers Morse tapers are in accordance with IS0 296 dealing with self-holding tapers for tool shanks (except for the dimensions al and 1 which are greater for certain tools than the corresponding dimensionsa and 12 given in IS0 296). 5 -,-,-