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Pipe Schedule Chart
ANSI/ASME B36.10M Standard - Steel Pipe Dimensions
Legend
NPS = Nominal Pipe Size
OD = Outside Diameter
ID = Inside Diameter (values shown for each schedule)
STD = Standard (same as Schedule 40 for most sizes)
XS = Extra Strong (same as Schedule 80 for most sizes)
XXS = Double Extra Strong
Note: Empty cells ("-") indicate that the particular schedule is not available for that pipe size. All dimensions are in millimeters (mm).
NPS
OD (mm)
Inside Diameter (ID) by Schedule
Sch 10
Sch 20
Sch 30
Sch 40 (STD)
Sch 60
Sch 80 (XS)
Sch 100
Sch 120
Sch 140
Sch 160
XXS
1/8"
10.29
-
-
-
6.83
-
5.46
-
-
-
-
-
1/4"
13.72
-
-
-
9.25
-
7.67
-
-
-
-
-
3/8"
17.14
-
-
-
12.52
-
10.74
-
-
-
-
-
1/2"
21.34
17.12
-
-
15.80
-
13.87
-
-
-
11.79
6.40
3/4"
26.67
22.45
-
-
20.93
-
18.85
-
-
-
15.54
11.02
1"
33.40
27.86
-
-
26.64
-
24.31
-
-
-
20.70
15.21
1-1/4"
42.16
36.63
-
-
35.05
-
32.46
-
-
-
29.46
22.76
1-1/2"
48.26
42.72
-
-
40.89
-
38.10
-
-
-
33.99
27.94
2"
60.32
54.79
-
-
52.50
-
49.25
-
-
-
42.85
38.18
2-1/2"
73.02
66.93
-
-
62.71
-
59.00
-
-
-
53.97
44.98
3"
88.90
82.80
-
-
77.93
-
73.66
-
-
-
66.65
58.42
3-1/2"
101.60
95.50
-
-
90.12
-
85.45
-
-
-
-
69.29
4"
114.30
108.20
-
-
102.26
-
97.18
-
92.05
-
87.33
80.06
5"
141.30
134.49
-
-
128.19
-
122.25
-
115.90
-
109.55
103.20
6"
168.27
161.47
-
-
154.05
-
146.33
-
139.73
-
131.75
124.38
8"
219.07
211.56
206.38
205.00
202.72
198.45
193.67
188.90
182.55
177.83
173.05
174.63
10"
273.05
264.67
260.35
257.45
254.51
247.65
242.87
236.52
230.17
222.25
215.90
222.25
12"
323.85
314.71
311.15
307.09
303.23
-
295.30
288.90
280.97
273.05
266.70
273.05
14"
355.60
346.05
342.90
339.75
336.55
-
330.20
-
317.50
-
307.95
-
16"
406.40
396.85
393.70
390.55
387.35
-
381.00
-
363.52
-
354.03
-
18"
457.20
447.65
444.50
441.35
438.15
-
428.65
-
409.55
-
398.48
-
20"
508.00
498.45
495.30
488.95
488.95
-
477.82
466.75
455.63
442.93
431.80
-
24"
609.60
598.53
596.90
590.55
590.55
-
574.65
560.37
547.67
531.83
517.55
-
30"
762.00
749.30
746.15
-
742.95
-
-
-
-
-
-
-
36"
914.40
901.70
898.55
-
895.35
-
-
-
-
-
-
-
References
ANSI/ASME B36.10M - Welded and Seamless Wrought Steel Pipe
ANSI/ASME B36.19M - Stainless Steel Pipe
Values represent Inside Diameter (ID) calculated from OD and standard wall thickness for each schedule
For NPS 14" and above, NPS corresponds to the actual outside diameter in inches
