DINFLANGE DIN 2637

(Dimensions in mm)

Nominal Pressure 100

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

Number
of
Holes

Bolt
Diameter

d2

10

14
17.2*)

100

20

70

45

28
32

1.8

4

6

40

2

1

4

M12

(1/2")

14

1.09

15

20
21.3*)

105

20

75

45

32
34

2

4

6

45

2

1

4

M12

(1/2")

14

1.19

25

30
33.7*)

140

24

100

58

48
52

2.6

4

8

65

2

1

4

M16

(5/8")

18

2.66

32

38
42.4*)

155

24

110

60

58
62

2.6

6

8

75

2

1

4

M20

(3/4")

23

3.20

40

44.5
48.3*)

170

26

125

62

65
70

2.9

6

10

85

3

1.5

4

M20

(3/4")

23

4.09

50

57
60.3*)

195

28

145

68

86
90

3.2

6

10

95

3

1.5

4

M24

(7/8")

27

5.98

65

76.1*)

220

30

170

76

108

3.6

6

12

120

3

1.5

8

M24

(7/8")

27

7.91

80

88.9*)

230

32

180

78

120

4

8

12

130

3

1.5

8

M24

(7/8")

27

8.95

100

108
114.3*)

265

36

210

90

145
150

5

8

12

160

3

1.5

8

M27

(1")

30

13.7

125

133
139.7*)

315

40

250

105

180

6.3

8

12

185

3

1.5

8

M30

(1 1/8")

33

22.7

150

159
168.3*)

355

44

290

115

210

7.1

10

12

215

3

1.5

12

M30

(1 1/8")

33

30.2

(175)

(191)
193.7*)

385

48

320

127

245

8.8

10

16

245

3

1.5

12

M30

(1 1/8")

33

38.9

200

216
219.1*)

430

52

360

130

278

10

10

16

270

3

1.5

12

M33

(1 1/4")

36

52.8

250

267
273*)

505

60

430

157

340

12.5

12

18

325

3

1.5

12

M36

(1 3/8")

39

81.4

300

318
323.9*)

585

68

500

170

400

14.2

12

18

375

4

2

16

M39

(1 1/2")

42

122

350

368
355.6*)

655

74

560

189

460

16

12

20

435

4

2

16

M45

(1 3/4")

48

165

Size in parentheses should preferably be avoided. 
*) 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 for nut and bolt holes. 
Marking: Every flange should be marked with the followinat the outside diameter : Company mark, nominal size, nominal pressure and material.