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UDC 62-229.2 : 621.9 DEUTSCHE NORMEN December 1978 7/24 Taper Shanks for Tools and Clamping Devices Type A I 2080 Part 1 Steilkegelschäfte für Werkzeuge und Spannzeuge, Form A Dimensions in mm For connection with draft Standard ISO/DIS 297 - 1976 published by the InternationalOrganization for Standardiza- tion (60). see Explanations. 1 Other relevant Standards DIN 254 Conical tapers DIN 7160 DIN 7168 Part 1 General tolerances (tolerances on dimensions without tolerance indication); linear and angular dimen- DIN 7178 Part 1 Conical tolerance and conical fit system for cones of tapers C = 1 : 3 to 1 : 500 and lengths from 6 to IS0 allowances for external dimensions (shafts), for nominal dimensions from 1 to 500 mm sions 630 mm; conical tolerance system 2 Dimensions, designation Details left unspecified are to be selected as appropriate. TYP A Design of transition in region e (e.g. recess or radius) at the discretion of the manufacturer\ Detail x Centering: 60" with protective countersink or with curved lead-in surface at the discretion of the manufacturer Designation of a 7/24 taper shank of Type A No. 40 with conical angle-tolerance quality AT4: Table 1. 7/24 taper shank D IN 2080 - A 40 AT 4 45 50 55 60 65 70 75 80 l) Exact values for the taper according to DIN 254 Continued on pages 2 and 3 Explanations on page 3 Teil 1 engi. Preisgr. 4 Vertr.-Nr.O104 Provided by IHS under license with DIN Not for Resale No reproduction or networking permitted without license from IHS

DIN 2080-1-1978 Conos ISO

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Page 1: DIN 2080-1-1978 Conos ISO

UDC 62-229.2 : 621.9 DEUTSCHE NORMEN December 1978

7/24 Taper Shanks for Tools and Clamping Devices

Type A I 2080

Part 1

Steilkegelschäfte für Werkzeuge und Spannzeuge, Form A

Dimensions in mm

For connection with draft Standard ISO/DIS 297 - 1976 published by the International Organization for Standardiza- tion (60). see Explanations.

1 Other relevant Standards DIN 254 Conical tapers DIN 7160 DIN 7168 Part 1 General tolerances (tolerances on dimensions without tolerance indication); linear and angular dimen-

DIN 7178 Part 1 Conical tolerance and conical f i t system for cones of tapers C = 1 : 3 to 1 : 500 and lengths from 6 to

IS0 allowances for external dimensions (shafts), for nominal dimensions from 1 to 500 mm

sions

630 mm; conical tolerance system

2 Dimensions, designation Details left unspecified are to be selected as appropriate.

TYP A Design of transition in region e (e.g. recess or radius) at the discretion of the manufacturer\

Detail x

Centering: 60" with protective countersink or with curved lead-in surface at the discretion of the manufacturer

Designation of a 7/24 taper shank of Type A No. 40 with conical angle-tolerance quality AT4:

Table 1. 7/24 taper shank D IN 2080 - A 40 AT 4

45 50 55 60 65 70 75 80

l ) Exact values for the taper according to DIN 254

Continued on pages 2 and 3 Explanations on page 3

Soie saia right8 of Gennan Standards (DIN-Normen) are with Beuth Verlag GmbH. Berlin 30 and Köln 1 DIN 2080 Teil 1 engi. Preisgr. 4 08.80

Vertr.-Nr.O104 Copyright Deutsches Institut Fur Normung E.V. Provided by IHS under license with DIN

Not for ResaleNo reproduction or networking permitted without license from IHS

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Page 2: DIN 2080-1-1978 Conos ISO

Page 2 DIN 2080 Part 1

Table 1. (continued)

l6 0

17 max.

t

w 3)

+ 0.5 5,5 8,2 10 11,5 11,5 14 16 16 20 20

16,2 22,5 29 35,3 45 60 72 86 104 132

0,12 0,12 0,12 02 0 2 02 0,3 03 03 03 1,6 1,6 1,6 2 2 2 2,5 23 2,s 23

3 Finish Fastening on the machine spindle with clamping device, e.g. according to DIN 63 69

Permissible deviations for dimensions without tolerance indication: DIN 7168 - medium

4 Tolerances on conical shaft The tolerances on the conical shaft correspond to conical angle-tolerance quality AT 3 to AT 7 according to DIN 7178 Part 1 and the following Table 2, see also Fig. 2. The tolerance quality is specified in the relevant dimension Standard.

Dimension a - rear shoulder plane to taper check dimension d l - with the tolerance of i 0.2 mm, ensures the correct longitudinal position of the 7/24 taper shank in the spindle nose. The conical angle tolerance AT, expressed as tolerance ATD of the diameter difference dc - d~ in the measurement planes C and D , guarantees firm seating of the conical shank at the major taper diameter.

The actual difference of the diameters dc and dD in the measurement planes C and D shall not be less than the value dc - d D specified in Table 2 and not greater than dc - d D + ATD.

I ,Measurement plane C

Figure 2.

Copyright Deutsches Institut Fur Normung E.V. Provided by IHS under license with DIN

Not for ResaleNo reproduction or networking permitted without license from IHS

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Page 3: DIN 2080-1-1978 Conos ISO

DIN 2080 Part 1 Page 3

d C - d D a 2 - Taper Size

designation

SK 30 12,25 SK 40 17,208

50 21,292

26,833 SK 45

N SK 50 II 8°17'50" 34,125 SK 55

Ln 8,29714 44,333 SK 60 55,709 70,292 SK 70

SK 75 85,75 SK 80 110,542

al O

h

Co el 03

SK 65 9 .. c

ATD I P

A ï 3 AT4 AT5 AT6 A T 7

42 0,002 0,003 0,005 0,008 0,013 59 0,003 0,005 0,007 0,012 0,019 73 0,003 0,005 0,007 0,012 0,019 92 0,004 0,006 0,009 0,015 0,023

117 0,004 0,006 0,009 0,015 0,023 152 0,005 0,008 0,012 0,019 0,030 191 0,005 0,008 0,012 0,019 0,031 241 0,006 0,010 0,015 0,024 0,039 294 0,006 0,010 0,015 0,024 0,047 379 0,008 0,012 0,019 0,030 0,047

Further Standards DIN 76 Part 1 DIN 2080 Part 2 (at present st i l l in draft form) 7/24 taper shanks for tools and clamping devices; Type B DIN 6369

Run-outs, undercuts; for IS0 metric screw threads according to DIN 13

Clamping fasteners for holding 7/24 taper shanks; screw thread connection for fastening tools

Explanations

This Standard is tactually identical with the following draft Standard issued by the International Organization for Standardization (60) ISO/DIS 297 *) - 1976: E: 7/24 tapers for tool shanks F: Cônes pour emmanchements d'outils à conicite 7/24 and International Standard

E: Tool shanks and equipment with 7/24 tapers - collar

F: Queues d'outils et d'equipments aux cônes a conicite

The following modifications and additions have been adopted compared with DIN 2080, April 1975 edition. The collar width k has been included. This can be calcu- lated from the previous edition of DIN 2080 from f - (a ? e ) . Dimension f has not been included because this would result in double dimensioning. Dimension f is contained in DIN 2080 Part 2 because this form is used for front clamping and hence precise definition of the taper meas- urement plane with respect to the front edge of the collar i s necessary so as to ensure satisfactory fastening. The dimension of the countersink l6 has been changed for shanks No. 30,40,50 and 55. This modification is not in conformity with ISO/DIS 297. I t does not inter- fere with automatic fastening of the shank according to DIN 2080 Part 1 with clamping devices according to

IS0 2583 *) - 1972:

dimensions

7/24 - Dimensions de la collerette

DIN 6369. The centering arrangement i s stipulated as a 60' slope and protective countersink or a curved lead-in surface, a t the discretion of the manufacturer to conform with the current state of technology. The dimensioning i s stipulated with reference to the reference plane of the maximum dimension of the taper and hence also conforms to DIN 2079 as a functional dimension. The recess width e has been chosen so that it is equal to or less than the nominal dimension a. The nominal dimension of the collar diameter d, is in agreement with IS0 2583 except for shanks No. 50 and 60 which have been included with dimensions 97.5 mm and 156mm. The smaller collar diameters have been selected for economic reasons and in addition have been allotted a tolerance of -g.4 mm. In DIN 2080 Part 1, for the first time tolerances on the conical shank according to DIN 7178 Part 1 in the toler- ance qualities AT 3 to AT7 have been adopted. The rele- vant tolerance quality i s quoted in the individual Stand- ards with 7/24 taper shanks according to DIN 2080 Part 1. It is intended to put forward these stipulations as a pro- posal to the appropriate I S 0 Secretariat for inclusion in I S 0 297.

*) IS0 Standards and draft Standards can be obtained in English and French versions from: Beuth Verlag GmbH, Burggrafenstrasse 4-10, 1000 Berlin 30.

Copyright Deutsches Institut Fur Normung E.V. Provided by IHS under license with DIN

Not for ResaleNo reproduction or networking permitted without license from IHS

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