Tiêu chuẩn iso 00494 2017

INTERNATIONAL
STANDARD

ISO
494
Third edition
2017-02

Cylindrical shank twist drills — Long
series
Forets à queue cylindrique — Série longue

Reference number
ISO 494:2017(E)
© ISO 2017


ISO 494:2017(E)

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ii

© ISO 2017 – All rights reserved


ISO 494:2017(E)

Contents

Page

Foreword ........................................................................................................................................................................................................................................ iv
1
2
3

Scope ................................................................................................................................................................................................................................. 1
Normative references ...................................................................................................................................................................................... 1
Terms and definitions ..................................................................................................................................................................................... 1

4

Dimensions ................................................................................................................................................................................................................. 1

5

Cutting length........................................................................................................................................................................................................... 4

6

4.1
4.2
4.3

General ........................................................................................................................................................................................................... 1
General dimensions ............................................................................................................................................................................ 1
Lengths set out as functions of diameter steps ........................................................................................................... 3

Shank ................................................................................................................................................................................................................................ 4

Annex A (informative) Relationship between designations in this document and the
ISO 13399 series ................................................................................................................................................................................................... 5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2017 – All rights reserved

iii


ISO 494:2017(E)

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work o f preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters o f
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
di fferent types o f ISO documents should be noted. This document was dra fted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso .org/directives).
Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f
patent rights. ISO shall not be held responsible for identi fying any or all such patent rights. Details o f
any patent rights identified during the development o f the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso .org/patents).

Any trade name used in this document is in formation given for the convenience o f users and does not

constitute an endorsement.

For an explanation on the voluntary nature o f standards, the meaning o f ISO specific terms and
expressions related to con formity assessment, as well as in formation about ISO’s adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 9, Tools
with defined cutting edges, cutting items.

This third edition cancels and replaces the second edition (ISO 494:2009), of which it constitutes a
minor revision with the following change:
— added Annex A, giving the relationship between the symbols of this document and the symbols
according to the ISO 13399 series.

iv

© ISO 2017 – All rights reserved


INTERNATIONAL STANDARD

ISO 494:2017(E)

Cylindrical shank twist drills — Long series
1 Scope
T h i s do c u ment s p e c i fie s the d i men s ion s o f c yl i nd ric a l s han k twi s t d ri l l s h avi ng worki ng leng th s i n the

long series.

T he c yl i nd ric a l sh an k j obb er a nd s tub s erie s d ri l l s and M ors e tap er sh an k d ri l l s are given i n I S O 2 3 5 .

2 Normative references

There are no normative references in this document.
3 Terms and definitions
No term s and defi nition s a re l i s te d i n th i s do c u ment.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at ctropedia .org/
— ISO Online browsing platform: available at .org/obp
4 Dimensions
4.1 General

All dimensions and tolerances are given in millimetres.
4.2 General dimensions
T he d i men s ion s o f c yl i nd ric a l s ha n k twi s t d ri l l s s ha l l b e i n accorda nce with the d i men s ion s shown i n

Figure 1 and given in Table 1.

Key

1 recess optional
Figure 1 — Dimensions of cylindrical shank twist drill

© ISO 2017 – All rights reserved

1


ISO 494:2017(E)

Table 1 — Dimensions of cylindrical shank twist drill

1 h8

d

1,00

1,10
1,20
1,30
1,40

1

l

33
37
41
45

1,50

2

l

56

6 ,10

60

6,20

6,30
65

6,40

70

1,60

1,70
1,80
1,90
2,00
2,10
2,20
2,30
2,40
2 ,50

3,50

3 ,60

3,70
3,80
3,90
4,00
4,10
4,20
4,30
4,40
4, 5 0

5,20

5,30

2

148

6,50

53

56

59

80

6,60

85

90

6 ,9 0

7,00
7,10
7,20
7,30

7,40

102

156

95

66

69

100

10 6

109

165

78

82

112

119

87

175
14 , 5 0

14 , 7 5

132

128

1 5 ,7 5

254

171

2 61

21,50

2 1 ,7 5

22,00

1 76

268

22 ,25

22 ,50

2 2 ,75

134

205

23,00

180

2 75

23,25

23,50

2 3 ,7 5

24,00
2 4, 2 5
185
2 4, 5 0

282

2 4,7 5

25 ,00

25,25

25,50

140

214

2 5 ,75

26,00

190

290

26,25

26,50

2 6 ,7 5

27,00

144

227

2 7, 2 5
19 5

2 7, 5 0

298

2 7, 7 5

28,00
149

220

28,25

28,50

2 8 ,7 5

29,00

16, 5 0

201

307

2 9, 2 5
154

235

1 6 ,75

2 9, 5 0

17,00

2 9,7 5

30,00

1 7, 2 5

1 7, 5 0
158
1 7, 7 5

16 6

21,25

16, 2 5

184

2

l

21,00

16 ,0 0

121

20,50

2 0 ,7 5

15,25

15,50

1

l

20,25

19 5

15 ,00

9, 6 0

9,70
9,80
9,90
10,00
10,10
10,20

10,30
10,40

20,00

14 , 2 5
11 5

1 h8

d

19 , 7 5

12,70
12,80
12,90
13,00
13,10
13,20
13,30
13,40
13,70
13,80
13,90
14,00

9, 5 0

126

2

l

11,70
11,80
11,90
12,00
12,10
12,20
12,30
12,40

13 ,60

8,60

8,70
8,80
8,90
9,00
9,10
9,20
9,30
9,40

1

l

13,50

8,50

73

11 , 5 0

1 2 ,60

7, 6 0

7,70
7,80
7,90
8,00
8,10
8,20
8,30
8,40

11,20
11,30
11,40

12 ,50

7, 5 0

62

1 h8

d

11 ,60

6,80

4,70
4,80
4,90
5 ,10

97

2

l

76

4, 6 0

5 ,00

1

l

6 , 70
50

2 ,60

2,70
2,80
2,90
3,00
3,10
3,20
3,30
3,40

1 h8

d

241

30, 25

30, 50

© ISO 2017 – All rights reserved


ISO 494:2017(E)

Table 1 (continued)
d1 h8

5,40
5,50
5,60
5,70
5,80
5,90

l1

91

l2

139

6,00

d1 h8

l1

10,50
10,60

10,70
10,80
10,90

11,00
11,10

128

l2

195

d1 h8

18,00

18,25
18,50
18,75

l1

l2

19,50

30,75

31,00

162

247

166

254

19,00

19,25

d1 h8

l1

207

l2

316

31,25
31,50

4.3 Lengths set out as functions of diameter steps

The lengths set out as functions of diameter steps shall be as given in Table 2.
Table 2 — Lengths set out as functions of diameter steps
Diameter ranges d1
Over
Up to and including

0,95
1,06

1,18
1,32

1,50

1,70
1,90
2,12

2,36
2,65

3,00

3,35
3,75
4,25
4,75
5,30
6,00
6,70
7,50
8,50
9,50
10,60

11,80

13,20
14,00

1,06

1,18
1,32

1,50

1,70
1,90
2,12

2,36
2,65

3,00

3,35
3,75
4,25
4,75
5,30
6,00
6,70
7,50
8,50
9,50
10,60

11,80
13,20
14,00
15,00

NOTE For tolerance on lengths, lengths

Corresponding lengths
l1

33
37
41

45
50
53
56
59
62
66
69

73
78
82
87
91
97

102
109
115

121
128
134
140
144

l2

56
60
65

70

76

80
85

90
95

100

106

112
119

126

132
139
148

156
165
175

184
195
205

214
220

l1 and l2 may vary, within one diameter step, between the minimum and
maximum limits corresponding respectively to the figures given for the nearest lower or upper step.
EXAMPLE
For diameter d1 = 4 mm, length l1 may vary between 73 mm and 82 mm from the nominal value 78 mm
and length l2 may vary between 112 mm and 126 mm from the nominal value 119 mm.

© ISO 2017 – All rights reserved

3

ISO 494:2017(E)

Table 2 (continued)
Diameter ranges d1
Over
Up to and including

15,00
16,00

17,00
18,00
19,00
20,00
21,20
22,40

23,60
25,00
26,50

28,00
30,00

16,00

17,00
18,00
19,00

20,00
21,20
22,40

23,60
25,00
26,50

28,00
30,00
31,50

NOTE For tolerance on lengths, lengths

Corresponding lengths
l1

l2

149

227

154
158
162
166

235

241
247

254
261
268
275

171

176

180

282
290
298
307

185

190
195

201
207

316

l1 and l2 may vary, within one diameter step, between the minimum and

maximum limits corresponding respectively to the figures given for the nearest lower or upper step.
EXAMPLE
For diameter d1 = 4 mm, length l1 may vary between 73 mm and 82 mm from the nominal value 78 mm
and length l2 may vary between 112 mm and 126 mm from the nominal value 119 mm.

5 Cutting length
The cutting length shall be at the manu facturer’s discretion. Unless otherwise specified, these drills

shall be right-hand cutting.
6 Shank

The cylindrical shank twist drills shall be manu factured without tenon drive.

4

© ISO 2017 – All rights reserved


ISO 494:2017(E)

Annex A

(informative)
Relationship between designations in this document and the
ISO 13399 series
For the relation s h ip b e twe en the de s ignation s i n th i s do c ument and pre ferre d s ymb ol s accord i ng to the

ISO 13399 series, see Table A.1.

Table A.1 — Relationship between designations in this document and

the ISO 13399 series
Symbol in
ISO 494 (this
document)

1

d

1

l

2

l

Reference in
ISO 494 (this
document)

Figure 1
Table 1
Figure 1
Table 1
Figure 1
Table 1

Symbol in the
ISO 13399

series

cutting diameter

DC

leng th ch ip flute

a
a

Property name in
the ISO 13399 series

overall length
connection diameter machine
side

LCF
OAL
D CON M S

Reference in
the ISO 13399 series
71 D 0 8 4 6 5 3 E 5 7 F

71 D C C C 2 7 D E F5 3

71 D 0 78 E B 7C 0 8 6

71 E B D B F5 0 6 0 E 6

1 (DC) in Figure 1.

D C O N M S h a s the s a me s i z e a s d

© ISO 2017 – All rights reserved

5


ISO 494:2017(E)

Bibliography
[1]

6

ISO 235 ,

Parallel shank jobber and stub series drills and Morse taper shank drills

© ISO 2017 – All rights reserved



ISO 494: 2 01 7(E)

ICS  25.100.30
Price based on 6 pages

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