Schedule 80 Pipe Dimensions
Wall thickness, bore and plain-end weight for all 28 sizes ASME B36.10M publishes in schedule 80, NPS 1/8 through NPS 24.
- Schedule
- Schedule 80
- Sizes published
- 28 (NPS 1/8 to NPS 24)
- Thinnest wall
- 0.095 in (2.4 mm) at NPS 1/8
- Thickest wall
- 1.219 in (31.0 mm) at NPS 24
- Standard
- ASME B36.10M
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Size | DN | Outside diameter | Wall thickness | Inside diameter | Weight, empty | Water (US gal/ft) | This size |
|---|---|---|---|---|---|---|---|
| NPS 1/8 | DN 6 | 0.40510.29 mm | 0.0952.41 mm | 0.2155.46 mm | 0.310.47 kg/m | 0.002 | detail → |
| NPS 1/4 | DN 8 | 0.54013.72 mm | 0.1193.02 mm | 0.3027.67 mm | 0.540.80 kg/m | 0.004 | detail → |
| NPS 3/8 | DN 10 | 0.67517.14 mm | 0.1263.20 mm | 0.42310.74 mm | 0.741.10 kg/m | 0.007 | detail → |
| NPS 1/2 | DN 15 | 0.84021.34 mm | 0.1473.73 mm | 0.54613.87 mm | 1.091.62 kg/m | 0.012 | detail → |
| NPS 3/4 | DN 20 | 1.05026.67 mm | 0.1543.91 mm | 0.74218.85 mm | 1.472.19 kg/m | 0.022 | detail → |
| NPS 1 | DN 25 | 1.31533.40 mm | 0.1794.55 mm | 0.95724.31 mm | 2.173.23 kg/m | 0.037 | detail → |
| NPS 1 1/4 | DN 32 | 1.66042.16 mm | 0.1914.85 mm | 1.27832.46 mm | 3.004.46 kg/m | 0.067 | detail → |
| NPS 1 1/2 | DN 40 | 1.90048.26 mm | 0.2005.08 mm | 1.50038.10 mm | 3.635.40 kg/m | 0.092 | detail → |
| NPS 2 | DN 50 | 2.37560.32 mm | 0.2185.54 mm | 1.93949.25 mm | 5.027.47 kg/m | 0.153 | detail → |
| NPS 2 1/2 | DN 65 | 2.87573.02 mm | 0.2767.01 mm | 2.32359.00 mm | 7.6611.40 kg/m | 0.220 | detail → |
| NPS 3 | DN 80 | 3.50088.90 mm | 0.3007.62 mm | 2.90073.66 mm | 10.2515.26 kg/m | 0.343 | detail → |
| NPS 3 1/2 | DN 90 | 4.000101.60 mm | 0.3188.08 mm | 3.36485.45 mm | 12.5118.61 kg/m | 0.462 | detail → |
| NPS 4 | DN 100 | 4.500114.30 mm | 0.3378.56 mm | 3.82697.18 mm | 14.9822.30 kg/m | 0.597 | detail → |
| NPS 4 1/2 | DN 115 | 5.000127.00 mm | 0.3559.02 mm | 4.290108.97 mm | 17.6126.21 kg/m | 0.751 | detail → |
| NPS 5 | DN 125 | 5.563141.30 mm | 0.3759.52 mm | 4.813122.25 mm | 20.7830.92 kg/m | 0.945 | detail → |
| NPS 6 | DN 150 | 6.625168.27 mm | 0.43210.97 mm | 5.761146.33 mm | 28.5742.52 kg/m | 1.354 | detail → |
| NPS 7 | DN 175 | 7.625193.67 mm | 0.50012.70 mm | 6.625168.27 mm | 38.0556.62 kg/m | 1.791 | detail → |
| NPS 8 | DN 200 | 8.625219.07 mm | 0.50012.70 mm | 7.625193.67 mm | 43.3964.57 kg/m | 2.372 | detail → |
| NPS 9 | DN 225 | 9.625244.47 mm | 0.50012.70 mm | 8.625219.07 mm | 48.7372.52 kg/m | 3.035 | detail → |
| NPS 10 | DN 250 | 10.750273.05 mm | 0.59415.09 mm | 9.562242.87 mm | 64.4395.88 kg/m | 3.730 | detail → |
| NPS 11 | DN 275 | 11.750298.45 mm | 0.50012.70 mm | 10.750273.05 mm | 60.0889.40 kg/m | 4.715 | detail → |
| NPS 12 | DN 300 | 12.750323.85 mm | 0.68817.48 mm | 11.374288.90 mm | 88.63131.90 kg/m | 5.278 | detail → |
| NPS 14 | DN 350 | 14.000355.60 mm | 0.75019.05 mm | 12.500317.50 mm | 106.13157.95 kg/m | 6.375 | detail → |
| NPS 16 | DN 400 | 16.000406.40 mm | 0.84421.44 mm | 14.312363.52 mm | 136.62203.31 kg/m | 8.357 | detail → |
| NPS 18 | DN 450 | 18.000457.20 mm | 0.93823.83 mm | 16.124409.55 mm | 170.93254.37 kg/m | 10.607 | detail → |
| NPS 20 | DN 500 | 20.000508.00 mm | 1.03126.19 mm | 17.938455.63 mm | 208.87310.84 kg/m | 13.128 | detail → |
| NPS 22 | DN 550 | 22.000558.80 mm | 1.12528.57 mm | 19.750501.65 mm | 250.82373.26 kg/m | 15.915 | detail → |
| NPS 24 | DN 600 | 24.000609.60 mm | 1.21930.96 mm | 21.562547.67 mm | 296.59441.37 kg/m | 18.969 | detail → |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
In this schedule the wall thickness coincides with XS in NPS 1/8 through NPS 11. Outside those sizes it does not, so never substitute one designation for the other without checking the number.
Common questions
What sizes is schedule 80 pipe made in?
ASME B36.10M publishes schedule 80 in 28 sizes, from NPS 1/8 through NPS 24. Wall thickness runs from 0.095 in (2.4 mm) at the small end to 1.219 in (31.0 mm) at the large end.
Does schedule 80 mean the same wall thickness in every size?
No. A schedule number is a series, not a thickness. It sets a wall that rises with the pipe size so the pressure rating stays roughly constant across the range — which is the whole point of the schedule system.