DINFLANGE DIN 2638

(Dimensions in mm)

Nominal Pressure 160

Pipe

Flange

Neck

Raised Face

Drilling

Approx.
Weight
(7.85 kg/dm3)
kg

Nominal
Size

d1

D

b

k

h1

d3

s

r1

h2

d4

f

r2

d51)

Number
of
Holes

Bolt
Diameter

d2

10

14
17.2*)

100

20

70

45

28
32

2

4

6

40

2

1

18

4

M12

(1/2")

14

1.09

15

20
21.3*)

105

20

75

45

32
34

2

4

6

45

2

1

24

4

M12

(1/2")

14

1.19

25

30
33.7*)

140

24

100

58

48
52

2.9

4

8

65

2

1

35

4

M16

(5/8")

18

2.66

40

44.5
48.3*)

170

28

125

64

65
70

3.6

6

10

85

3

1.5

52

4

M20

(3/4")

23

4.30

50

57
60.3*)

195

30

145

75

86
90

4

6

10

95

3

1.5

63

4

M24

(7/8")

27

6.25

65

7.61*)

220

34

170

82

108

5

6

12

105

3

1.5

85

8

M24

(7/8")

27

8.35

80

88.9*)

230

36

180

86

120

6.3

8

12

125

3

1.5

97

8

M24

(7/8")

27

9.75

100

108
114.3*)

265

40

210

100

145
150

8

8

12

145

3

1.5

124

8

M27

(1")

30

14.8

125

(146)
139.7*)

315

44

250

115

180

10

8

14

185

3

1.5

153

8

M30

(1 1/8")

33

23.0

150

(171)
168.3*)

355

50

290

128

210

12.5

10

14

215

3

1.5

181

12

M30

(1 1/8")

33

32.5

(175)

(191)
193.7*)

390

54

320

138

245

14.2

10

16

235

3

1.5

218

12

M33

(1 1/4")

36

43.5

200

216
219.1*)

430

60

360

140

278

16

10

16

260

3

1.5

243

12

M33

(1 1/4")

36

59.4

250

267
273*)

515

68

430

155

340

20

12

18

325

3

1.5

298

12

M39

(1 1/2")

42

94.5

300

318
323.9*)

585

78

500

175

400

22.2

12

18

375

4

2

345

16

M39

(1 1/2")

42

136

1) Diameter for lens sealing by DIN 2696 
*) Outer dimameter of pipe corresponds to ISO
recommendation R64.
Material (to be specified by orderer):
RSt. 42-2 by DIN 17100 for temperature 300 °C 
Weldable heat-treated steel for temperature > 300 °C.
Process: Machining the outside diameter, bore, gasket surface, bevel end for welding, spot face fot nut and bolt holes.
Marking: Every flange should be marked with the followinat the outside diameter : Company mark, nominal size, nominal pressure and material.