DINFLANGE DIN 2634

(Dimensions in mm)

Nominal Pressure 25

Pipe

Flange

Neck

Raised Face

Drilling

Approx.
Weight
(7.85 kg/dm3)
kg

Nominal
Size

d1

D

b

k

h1

d3

s

r

h2

d4

f

Number
of
Holes

Bolt
Diameter

d2

(175)

(191)
193.7*)

330

28

280

75

215
218

5.6

10

15

248

3

12

M24

(7/8")

27

13.4

200

216
219.1*)

360

30

310

80

240
244

6.3

10

16

278

3

12

M24

(7/8")

27

17.0

250

267
273*)

425

32

370

88

292
298

7.1

12

18

335

3

12

M27

(1")

30

24.4

300

318
323.9*)

485

34

430

92

345
352

8

12

18

395

4

16

M27

(1")

30

31.2

350

368
355.6*)

555

38

490

100

398

8

12

20

450

4

16

M30

(1 1/8")

33

45.0

400

419
406.4*)

620

40

550

110

452

8.8

12

20

505

4

16

M33

(1 1/4")

36

58.7

500

521
508*)

730

44

660

125

558

10

12

20

615

4

20

M33

(1 1/4")

36

86.1

600

622
609.6*)

845

46

770

125

660

11

12

20

720

5

20

M36

(1 3/8")

39

101

700

720
711.2*)

960

46

875

125

760

12.5

12

20

820

5

24

M39

(1 1/2")

42

134

800

820
812.8*)

1085

50

990

135

865

14.2

12

22

930

5

24

M45

(1 3/4")

48

183

900

920
914.4*)

1185

54

1090

145

968

16

12

24

1030

5

28

M45

(1 3/4")

48

232

1000

1020
1016*)

1320

58

1210

155

1070

17.5

16

24

1140

5

28

M52

(2")

56

302

Refet to DIN 2635 for nominal size 10-150.
Size in parentheses should preferably be avoided. 
*) Outer dimameter of pipe corresponds to ISO
recommendation R64.
Material (to be specified by orderer):
St. 37-2 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, and bolt holes.