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).
NPSOD
(mm)		Inside Diameter (ID) by Schedule
Sch 10Sch 20Sch 30Sch 40 (STD)Sch 60Sch 80 (XS)Sch 100Sch 120Sch 140Sch 160XXS
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"21.3417.12--15.80-13.87---11.796.40
3/4"26.6722.45--20.93-18.85---15.5411.02
1"33.4027.86--26.64-24.31---20.7015.21
1-1/4"42.1636.63--35.05-32.46---29.4622.76
1-1/2"48.2642.72--40.89-38.10---33.9927.94
2"60.3254.79--52.50-49.25---42.8538.18
2-1/2"73.0266.93--62.71-59.00---53.9744.98
3"88.9082.80--77.93-73.66---66.6558.42
3-1/2"101.6095.50--90.12-85.45----69.29
4"114.30108.20--102.26-97.18-92.05-87.3380.06
5"141.30134.49--128.19-122.25-115.90-109.55103.20
6"168.27161.47--154.05-146.33-139.73-131.75124.38
8"219.07211.56206.38205.00202.72198.45193.67188.90182.55177.83173.05174.63
10"273.05264.67260.35257.45254.51247.65242.87236.52230.17222.25215.90222.25
12"323.85314.71311.15307.09303.23-295.30288.90280.97273.05266.70273.05
14"355.60346.05342.90339.75336.55-330.20-317.50-307.95-
16"406.40396.85393.70390.55387.35-381.00-363.52-354.03-
18"457.20447.65444.50441.35438.15-428.65-409.55-398.48-
20"508.00498.45495.30488.95488.95-477.82466.75455.63442.93431.80-
24"609.60598.53596.90590.55590.55-574.65560.37547.67531.83517.55-
30"762.00749.30746.15-742.95-------
36"914.40901.70898.55-895.35-------

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