Pipe Dimensions DN / DIN / ASME / AISI – Table

Author:

Piotr Sompoliński

Date added:

19.08.2026 year

DIN / EN ISO 1127 and ASME B36.10 / B36.19 Pipe Dimensions Table

The table compares the dimensions of steel pipes according to two different designation systems: DIN / EN ISO 1127 – the European system – and ASME B36.10 / B36.19 – the American system.

It can be used to find the American equivalent of the European DN designation. For example, DN 25 corresponds to a 1-inch pipe.

The table also provides the actual dimensions and weights of pipes manufactured in each series. For example, a DN 25 pipe in Series 3 has an outside diameter of 33.7 mm, a wall thickness of 2.6 mm, and a weight of 2.02 kg/m. Its closest American equivalent is a 1-inch schedule 10 pipe.

DN – diameter nominal, nominal diameter. This is NOT an exact diameter but an approximate designation.

OD – outside diameter, expressed in mm. The actual dimension specified by the relevant standards.

ASME NPS – nominal pipe size, the nominal pipe size according to ASME, expressed in inches. This is an approximate designation.

DIN Series 1–5 – a DIN production series describing wall thickness. Series 4 does NOT mean that the wall thickness is 4 mm. It is an approximate designation: generally, the higher the series number, the thicker the wall.

ASME Schedule 5S, 20, 160, XXS, etc. – an ASME designation describing wall thickness. Schedule 20 does NOT mean that the wall thickness is 20 mm or 2 inches. It is simply a designation used when ordering pipes. Generally, the higher the schedule number, the thicker the wall.

The weights given in the table apply to stainless steel pipes.

DIN

ASME

Pipe wall thickness [mm]
and weight [kg/m]
for DIN production series 1 to 5 and ASME production schedules from 5s to XXS

OD
[mm]

NPS
[cal]

OD
[mm]

DIN
serie 1

ASME
schedule
5s

ASME
schedule
5

ASME
schedule
10s

ASME
schedule
10

DIN
serie 2

DIN
serie 3

ASME
schedule
STD 40s

DIN
serie 4

ASME
schedule
XS 80s

DIN
serie 5

ASME
schedule
20

ASME
schedule
30

ASME
schedule
40

ASME
schedule
60

ASME
schedule
80

ASME
schedule
100

ASME
schedule
120

ASME
schedule
140

ASME
schedule
160

ASME
schedule
XXS

10.2

1/8

10.29

1.24
0.28

1.73
0.37

2.41
0.48

1.45
0.32

1.73
0.37

2.41
0.48

13.5

13.72

1.65
0.5

2.21
0.64

3.02
0.81

1.85
0.55

2.21
0.64

3.02
0.81

17.2

3/8

17.15

1.65
0.64

2.31
0.86

3.20
1.12

2.11
0.79

2.31
0.86

3.20
1.12

21.3

21.34

1.6
0.79

1.65
0.81

2.11
1.02

2.0
0.97

2.77
1.29

3.2
1.45

3.73
1.64

4.0
1.73

2.41
1.14

2.77
1.29

3.73
1.64

4.78
1.98

7.47
2.59

26.9

26.67

1.6
1.01

1.65
1.03

2.11
1.3

2.3
1.42

2.87
1.71

3.2
1.90

3.91
2.23

4.0
2.29

2.41
1.46

2.87
1.71

3.91
2.23

5.56
2.94

7.82
3.69

33.7

33.4

2
1.59

1.65
1.31

2.77
2.12

2.6
2.02

3.38
2.54

3.2
2.44

4.55
3.29

4.0
2.97

2.90
2.21

3.38
2.54

4.55
3.29

6.35
4.30

9.09
5.53

42.4

1 ¼

42.16

2
2.02

1.65
1.67

2.77
2.73

2.6
2.59

3.56
3.44

3.6
3.50

4.85
4.53

4.0
3.85

2.97
2.91

3.56
3.44

4.85
4.53

6.35
5.69

9.70
7.88

48.3

1 ½

48.26

2
2.32

1.65
1.93

2.77
3.16

2.6
2.98

3.68
4.11

4.0
4.44

5.08
5.49

5.0
5.42

3.18
2.59

3.68
4.11

5.08
5.49

7.14
7.35

10.15
9.69

60.3

60.33

2
2.92

1.65
2.42

2.77
3.9

2.9
4.17

3.91
5.52

4.5
6.29

5.54
7.60

5.6
7.67

3.18
4.55

3.91
5.52

5.54
7.60

8.74
11.29

11.07
13.65

76.1

2 ½

73.03

2.3
4.25

2.11
3.75

3.05
5.34

2.9
5.32

5.16
8.77

5.0
8.90

7.01
11.59

7.1
12.27

4.78
8.17

5.16
8.77

7.01
11.59

9.53
15.19

14.02
20.71

88.9

88.9

2.3
4.99

2.11
4.59

3.05
6.56

3.2
6.87

5.49
11.47

5.6
11.68

7.62
15.51

8.0
16.20

4.78
10.07

5.46
11.47

7.62
15.51

11.13
21.67

15.24
28.11

101.6

3 ½

101.6

2.11
5.26

3.05
7.53

5.74
13.78

8.08
18.92

4.78
11.59

5.74
13.78

8.08
18.92

100

114.3

114.3

2.6
7.27

2.11
5.93

3.05
8.50

3.6
9.98

6.02
16.32

6.3
17.04

8.56
22.66

8.8
23.25

4.78
13.11

6.03
16.32

8.56
22.66

11.13
28.75

13.49
34.05

17.12
41.66

125

139.7

141.3

2.6
8.93

2.77
9.61

3.40
11.74

4.0
13.59

6.55
22.10

6.3
21.04

9.53
31.44

10.0
32.47

6.55
22.10

9.53
31.44

12.70
48.89

15.88
49.87

19.05
58.31

150

168.3

168.28

2.6
10.79

2.77
11.48

3.40
14.04

4.0
16.46

4.5
18.46

7.11
28.69

7.1
28.66

10.97
43.21

11.0
43.32

7.11
28.69

10.97
43.21

14.27
55.03

18.26
68.59

21.95
80.42

200

219.1

219.08

2.9
15.7

2.77
15.0

3.76
20.27

4.5
24.18

6.3
33.57

8.18
43.20

8.0
42.29

12.70
65.63

12.5
64.66

6.35
33.82

7.04
33.38

8.18
43.20

10.31
53.89

12.70
65.63

15.09
77.07

18.26
91.95

20.62
102.46

23.01
112.96

22.23
109.57

250

273

273.05

2.9
19.61

3.40
22.96

4.19
28.21

5.0
33.55

6.3
42.07

9.27
61.23

8.8
58.21

12.70
82.79

14.2
92.02

6.35
42.40

7.80
51.80

9.27
61.23

12.70
82.79

15.09
97.47

18.26
116.49

21.44
135.07

25.40
157.50

28.58
174.94

25.40
157.50

300

323.9

323.85

2.9
23.31

3.96
31.72

4.57
36.53

5.6
44.63

7.1
56.32

9.53
75.00

10.0
78.60

12.70
98.94

16.0
123.35

6.35
50.48

8.38
66.19

10.31
80.94

14.27
110.61

17.48
134.09

21.44
162.34

25.40
189.81

28.58
211.30

33.32
242.38

25.40
189.81

350

355.6

355.6

3.2
28.24

3.96
34.87

4.78
41.99

6.35
55.53

5.6
49.08

8.0
69.63

9.53
82.58

11.0
94.91

12.70
109.04

17.5
148.15

7.92
68.95

9.53
82.58

11.13
96.00

15.09
128.66

19.05
160.53

23.83
197.96

27.79
228.10

31.75
257.46

35.71
286.02

400

406.4

406.4

3.2
32.31

4.19
42.2

4.78
48.07

6.35
63.61

6.3
63.11

8.8
87.61

9.53
94.70

12.5
123.28

12.70
125.19

20.0
193.50

7.92
79.02

9.53
94.70

12.70
125.19

16.66
162.58

21.44
206.66

26.19
249.33

30.96
291.04

36.53
338.30

40.49
370.96

450

457.2

457.2

4
45.39

4.19
47.53

4.78
54.15

6.35
71.68

6.3
71.13

10.0
111.97

9.53
106.82

14.2
157.51

12.70
141.35

22.2
241.80

7.92
89.09

11.13
124.31

14.27
158.26

19.05
208.99

23.83
285.58

29.36
314.52

34.93
369.32

39.67
414.72

45.24
466.64

500

508

508

4
50.48

4.78
60.23

5.54
69.70

6.35
79.76

6.3
79.14

11.0
136.89

9.53
118.94

16.0
197.10

12.7
157.50

25.0
302.34

9.53
118.94

12.70
157.50

15.09
186.24

20.625
251.63

26.19
315.95

32.54
387.38

38.10
448.27

44.45
515.91

50.01
573.48

558.8

558.8

4.78
66.31

5.54
76.74

6.35
87.84

9.53
131.07

12.70
173.65

9.53
131.07

12.70
173.65

22.23
298.66

28.58
379.43

34.93
458.17

41.28
534.90

47.63
609.61

53.98
682.30

600

609.6

609.6

5
75.69

5.54
83.79

6.35
95.91

6.3
95.17

12.5
186.88

9.53
143.19

17.5
259.44

12.70
189.81

30.0
435.37

9.53
143.19

14.27
212.71

17.48
259.15

24.61
360.47

30.96
448.56

38.89
555.73

46.02
649.40

52.37
730.68

59.54
820.02

660.4

9.53
155.31

12.70
205.96

12.70
205.95

700

711

711.2

5
88.39

7.1
125.13

12.5
218.62

9.53
167.43

12.70
222.12

15.88
276.47

762

6.35
120.14

7.92
149.54

9.53
179.55

12.70
238.27

15.88
296.67

800

813

812.8

5.6
113.21

8.0
161.25

12.5
250.54

9.53
191.67

12.70
254.42

15.88
316.86

17.48
348.09

863.6

9.53
203.80

12.70
270.58

15.88
337.06

17.48
370.32

900

914

914.4

6.3
143.18

10.0
226.35

12.5
282.15

9.53
215.92

12.70
286.73

15.88
357.26

19.05
427.07

Quick Reference – DN to Inch Conversion

DN 6 corresponds to 1/8 inch
DN 8 corresponds to 1/4 inch
DN 10 corresponds to 3/8 inch
DN 15 corresponds to 1/2 inch
DN 20 corresponds to 3/4 inch
DN 25 corresponds to 1 inch
DN 32 corresponds to 1 1/4 inches
DN 40 corresponds to 1 1/2 inches
DN 50 corresponds to 2 inches
DN 65 corresponds to 2 1/2 inches
DN 80 corresponds to 3 inches
DN 100 corresponds to 4 inches
DN 125 corresponds to 5 inches
DN 150 corresponds to 6 inches
DN 200 corresponds to 8 inches
DN 400 corresponds to 16 inches
And so on – as a rough rule of thumb, every additional 25 DN corresponds to approximately 1 inch.

Post author

Piotr Sompoliński

CSO Virgamet

p.sompolinski@virgamet.pl

+48 793 726 124

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