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NPS Nominal Pipe Size and DN Diameter Nominal Conversion Chart








Gauge Size | Pipe Schdule | Nominal Pipe Size | Sheet Metal Gauge | Stainless Steel Pipe Sizes | Stainless Steel Tube Size | Stainless Steel Pipe Specification | Stainless Steel Pipe Dimensions | ANSI Pipe Chart | Inch to mm Chart | EN 10253 4 Structural Dimensions of fittings ISO 5251 ISO 3419 | Stainless Steel Tubing Sizes

The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'. Pipe is a ubiquitous product in the construction industry. It is made of a wide variety of materials - galvanized steel, black steel, copper, cast iron, concrete, and various plastics such as ABS, PVC, CPVC, polyethylene and polybutylene, among others.

Pipes are identified by "nominal" or "trade" names that are loosely related to the actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and an outside diameter of about 2 5/8 inches. According to ASME B36.10 and ASME B 36.19.

It is common to identify pipes by inches using NPS or " Nominal Pipe Size ". The metric equivalent is called DN or "diametre nominel". The metric designations conform to International Standards Organization ISO usage and apply to all plumbing, natural gas, heating oil, and miscellaneous piping used in buildings. The use of NPS does not conform to American Standard pipe designations where the term NPS means "National Pipe Thread Straight".



Diameter Nominal
DN
(mm)
Nominal Pipe Size
NPS
(inches)
6
1/8
8
1/4
10
3/8
15
1/2
20
3/4
25
1
32
1 1/4
40
1 1/2
50
2
65
2 1/2
80
3
100
4
150
6
200
8
250
10
300
12
350
14
400
16
450
18
500
20
550
22
600
24
650
26
700
28
750
30
800
32
900
36
1000
40
1050
42
1100
44
1200
48
1300
52
1400
56
1500
60
1600
64
1700
68
1800
72
1900
76
2000
80
2200
88

NPS Nominal Pipe Size / Pipe Schdule - according to ASME B36.10M and ASME B36.19M
NPS DN OD
inch
OD
mm
SCH5S
mm
SCH10S
mm
SCH10
mm
SCH20
mm
SCH30
mm
STD
mm
SCH40S
mm
SCH40
mm
SCH60
mm
XS
mm
SCH80S
mm
SCH80
mm
SCH100
mm
SCH120
mm
SCH140
mm
SCH160
mm
XXS
mm
  1/8 6 0.405 10.3   1.24 1.24   1.45 1.73 1.73 1.73   2.41 2.41 2.41          
  1/4 8 0.540 13.7   1.65 1.65   1.85 2.24 2.24 2.24   3.02 3.02 3.02          
  3/8 10 0.675 17.1   1.65 1.65   1.85 2.31 2.31 2.31   3.20 3.20 3.20          
  1/2 15 0.840 21.3 1.65 2.11 2.11   2.41 2.77 2.77 2.77   3.73 3.73 3.73       4.78 7.47
  3/4 20 1.050 26.7 1.65 2.11 2.11   2.41 2.87 2.87 2.87   3.91 3.91 3.91       5.56 7.82
1 25 1.315 33.4 1.65 2.77 2.77   2.90 3.38 3.38 3.38   4.55 4.55 4.55       6.35 9.09
1 1/4 32    1.660 42.2 1.65 2.77 2.77   2.97 3.56 3.56 3.56   4.85 4.85 4.85       6.35 9.70
1 1/2 40    1.900 48.3 1.65 2.77 2.77   3.18 3.68 3.68 3.68   5.08 5.08 5.08       7.14 10.15
2 50 2.375 60.3 1.65 2.77 2.77   3.18 3.91 3.91 3.91   5.54 5.54 5.54       8.74 11.07
2 1/2 65    2.875 73 2.11 3.05 3.05   4.78 5.16 5.16 5.16   7.01 7.01 7.01       9.53 14.02
3 80 3.500 88.9 2.11 3.05 3.05   4.78 5.49 5.49 5.49   7.62 7.62 7.62       11.13 15.24
3 1/2 90    4.000 101.6 2.11 3.05 3.05   4.78 5.74 5.74 5.74   8.08 8.08 8.08          
4 100 4.500 114.3 2.11 3.05 3.05   4.78 6.02 6.02 6.02   8.56 8.56 8.56   11.13   13.49 17.12
5 125 5.563 141.3 2.77 3.40 3.40     6.55 6.55 6.55   9.53 9.53 9.53   12.70   15.88 19.05
6 160 6.625 168.3 2.77 3.40 3.40     7.11 7.11 7.11   10.97 10.97 10.97   14.27   18.26 21.95
8 200 8.625 219.1 2.77 3.76 3.76 6.35 7.04 8.18 8.18 8.18 10.31 12.70 12.70 12.70 15.09 18.26 20.62 23.01 22.23
10 250 10.750 273.0 3.40 4.19 4.19 6.35 7.80 9.27 9.27 9.27 12.70 12.70 12.70 15.09 18.26 21.44 25.40 28.58 25.40
12 300 12.750 323.8 3.96 4.57 4.57 6.35 8.38 9.53 9.53 10.31 14.27 12.70 12.70 17.48 21.44 25.40 28.58 33.32 25.40
14 350 14.000 355.6 3.96 4.78 6.35 7.92 9.53 9.53 9.53 11.13 15.09 12.70 12.70 19.05 23.83 27.79 31.75 35.71  
16 400 16.000 406.4 4.19 4.78 6.35 7.92 9.53 9.53 9.53 12.70 16.66 12.70 12.70 21.44 26.19 30.96 36.53 40.49  
18 450 18.000 457.2 4.19 4.78 6.35 7.92 11.13 9.53 9.53 14.27 19.05 12.70 12.70 23.83 29.36 34.93 39.67 45.24  
20 500 20.000 508 4.78 5.54 6.35 9.53 12.70 9.53 9.53 15.09 20.62 12.70 12.70 26.19 32.54 38.10 44.45 50.01  
22 550 22.000 558.8 4.78 5.54 6.35 9.53 12.70 9.53     22.23 12.70   28.58 34.93 41.28 47.63 53.98  
24 600 24.000 609.6 5.54 6.35 6.35 9.53 14.27 9.53 9.53 17.48 24.61 12.70 12.70 30.96 38.89 46.02 52.37 59.54  
26 650 26.000 660.4     7.92 12.70   9.53       12.70              
28 700 28.000 711.2     7.92 12.70 15.88 9.53       12.70              
30 750 30.000 762 6.35 7.92 7.92 12.70 15.88 9.53       12.70              
32 800 32.000 812.8     7.92 12.70 15.88 9.53   17.48   12.70              
34 850 34.000 863.6     7.92 12.70 15.88 9.53   17.48   12.70              
36 900 36.000 914.4     7.92 12.70 15.88 9.53   19.05   12.70              
38 950 38.000 965.2           9.53       12.70              
40 1000 40.000 1016           9.53       12.70              
42 1050 42.000 1066.8           9.53       12.70              

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Related References:
Pipe Schedule
Stainless Steel Tube Size
ASME B36.10M Welded and Seamless Wrought Steel Pipe
ASME B36.19M Stainless Steel Pipe

Related References:
Pipe Schedule
Gauge Size
Nominal Pipe Size
Stainless Steel Pipe Dimensions
Sheet Metal Gauge
Stainless Steel Pipe Size
ANSI Standard Pipe Chart
Inch to mm Chart
B.W.G. - Birmingham Wire Gauge
A.S.W.G. American Standard Wire Gauge
Gauge Tolerances of Stainless Steel
Conversion Table of Temperatue, Length,Mass,Pressure
NPS-Nominal-Pipe-Size and DN - Diametre Nominal
ISO Tolerances For Fasteners ISO Tolerance Chart|Machining Process associated with ISO IT Tolerance Grade Stainless Steel Thickness Weight Table
Galvanized Structural Steel Thickness Weight Table
Cold Rolled Steel Thickness Weight Table
Hot Rolled Steel Thickness Weight Table

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UNS N08020 Alloy 20 Tubing
UNS N02200 Alloy 200 Tube
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N06600 Inconel 600 Tube
N06601 Inconel 601 Tubing
N06625 Inconel 625 Tubes
N08800 Incoloy 800 Tube
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EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube