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Carbon Steel Pipe Schedule Chart (ASME B36.10M)

Pipe schedule chart for welded and seamless carbon steel pipe, NPS 1/8 to 24, giving outside diameter and wall thickness in mm for every schedule.

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Wall thickness in mm by schedule

NPSDNOD mmSch 10Sch 20Sch 30Sch 40STDSch 60Sch 80XSSch 100Sch 120Sch 140Sch 160XXS
1/8610.31.241.451.731.732.412.41
1/4813.71.651.852.242.243.023.02
3/81017.11.651.852.312.313.203.20
1/21521.32.112.412.772.773.733.734.787.47
3/42026.72.112.412.872.873.913.915.567.82
12533.42.772.903.383.384.554.556.359.09
1 1/43242.22.772.973.563.564.854.856.359.70
1 1/24048.32.773.183.683.685.085.087.1410.15
25060.32.773.183.913.915.545.548.7411.07
2 1/26573.03.054.785.165.167.017.019.5314.02
38088.93.054.785.495.497.627.6211.1315.24
3 1/290101.63.054.785.745.748.088.08
4100114.33.054.786.026.028.568.5611.1313.4917.12
5125141.33.406.556.559.539.5312.7015.8819.05
6150168.33.407.117.1110.9710.9714.2718.2621.95
8200219.13.766.357.048.188.1810.3112.7012.7015.0918.2620.6223.0122.23
10250273.04.196.357.809.279.2712.7015.0912.7018.2621.4425.4028.5825.40
12300323.84.576.358.3810.319.5314.2717.4812.7021.4425.4028.5833.3225.40
14350355.66.357.929.5311.139.5315.0919.0512.7023.8327.7931.7535.71
16400406.46.357.929.5312.709.5316.6621.4412.7026.1930.9636.5340.49
18450457.06.357.9211.1314.279.5319.0523.8312.7029.3634.9339.6745.24
20500508.06.359.5312.7015.099.5320.6226.1912.7032.5438.1044.4550.01
22550559.06.359.5312.709.5322.2328.5812.7034.9341.2847.6353.98
24600610.06.359.5314.2717.489.5324.6130.9612.7038.8946.0252.3759.54
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About this Table

Pipe schedule chart for welded and seamless carbon steel pipe, NPS 1/8 to 24, giving outside diameter and wall thickness in mm for every schedule.

Basis: ASME B36.10M Welded and Seamless Wrought Steel Pipe (metric values). Outside diameter is fixed for each NPS; the schedule sets the wall.

How to use

  1. Find the nominal pipe size (NPS) or DN in the first columns.
  2. Read across to the schedule; the value is the nominal wall thickness in mm.
  3. Inside diameter = OD − 2 × wall. Mill tolerance on wall is usually −12.5 %.

Notes

  • Blank cells mean that schedule is not listed for that size.
  • STD equals Sch 40 up to NPS 10 and XS equals Sch 80 up to NPS 8.

Related tools

Pipe Schedule Chart ToolFree on instrumentationblog.inPipe Wall Thickness CalculatorFree on instrumentationblog.inPipe Volume and Weight CalculatorFree on instrumentationblog.in
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Frequently Asked Questions

What is the wall thickness of 2 inch Sch 40 pipe?

3.91 mm, with an outside diameter of 60.3 mm.

Is Sch 40 the same as STD?

Up to NPS 10 yes. From NPS 12 STD is 9.53 mm while Sch 40 is thicker.

Does the OD change with schedule?

No. OD is fixed for each NPS; a heavier schedule reduces the bore.

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