Double Extra Strong (XXS) Pipe Dimensions
Wall thickness, bore and plain-end weight for all 17 sizes ASME B36.10M publishes in double extra strong (xxs), NPS 1/2 through NPS 12.
- Schedule
- Double Extra Strong (XXS)
- Sizes published
- 17 (NPS 1/2 to NPS 12)
- Thinnest wall
- 0.294 in (7.5 mm) at NPS 1/2
- Thickest wall
- 1.000 in (25.4 mm) at NPS 10
- 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 1/2 | DN 15 | 0.84021.34 mm | 0.2947.47 mm | 0.2526.40 mm | 1.712.55 kg/m | 0.003 | detail → |
| NPS 3/4 | DN 20 | 1.05026.67 mm | 0.3087.82 mm | 0.43411.02 mm | 2.443.63 kg/m | 0.008 | detail → |
| NPS 1 | DN 25 | 1.31533.40 mm | 0.3589.09 mm | 0.59915.21 mm | 3.665.45 kg/m | 0.015 | detail → |
| NPS 1 1/4 | DN 32 | 1.66042.16 mm | 0.3829.70 mm | 0.89622.76 mm | 5.217.76 kg/m | 0.033 | detail → |
| NPS 1 1/2 | DN 40 | 1.90048.26 mm | 0.40010.16 mm | 1.10027.94 mm | 6.419.54 kg/m | 0.049 | detail → |
| NPS 2 | DN 50 | 2.37560.32 mm | 0.43611.07 mm | 1.50338.18 mm | 9.0313.44 kg/m | 0.092 | detail → |
| NPS 2 1/2 | DN 65 | 2.87573.02 mm | 0.55214.02 mm | 1.77144.98 mm | 13.7020.38 kg/m | 0.128 | detail → |
| NPS 3 | DN 80 | 3.50088.90 mm | 0.60015.24 mm | 2.30058.42 mm | 18.5827.66 kg/m | 0.216 | detail → |
| NPS 3 1/2 | DN 90 | 4.000101.60 mm | 0.63616.15 mm | 2.72869.29 mm | 22.8534.00 kg/m | 0.304 | detail → |
| NPS 4 | DN 100 | 4.500114.30 mm | 0.67417.12 mm | 3.15280.06 mm | 27.5440.99 kg/m | 0.405 | detail → |
| NPS 4 1/2 | DN 115 | 5.000127.00 mm | 0.71018.03 mm | 3.58090.93 mm | 32.5348.41 kg/m | 0.523 | detail → |
| NPS 5 | DN 125 | 5.563141.30 mm | 0.75019.05 mm | 4.063103.20 mm | 38.5557.37 kg/m | 0.674 | detail → |
| NPS 6 | DN 150 | 6.625168.27 mm | 0.86421.95 mm | 4.897124.38 mm | 53.1679.11 kg/m | 0.978 | detail → |
| NPS 7 | DN 175 | 7.625193.67 mm | 0.87522.22 mm | 5.875149.22 mm | 63.0893.87 kg/m | 1.408 | detail → |
| NPS 8 | DN 200 | 8.625219.07 mm | 0.87522.22 mm | 6.875174.62 mm | 72.43107.78 kg/m | 1.928 | detail → |
| NPS 10 | DN 250 | 10.750273.05 mm | 1.00025.40 mm | 8.750222.25 mm | 104.13154.97 kg/m | 3.124 | detail → |
| NPS 12 | DN 300 | 12.750323.85 mm | 1.00025.40 mm | 10.750273.05 mm | 125.49186.75 kg/m | 4.715 | detail → |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Common questions
What sizes is double extra strong (xxs) pipe made in?
ASME B36.10M publishes double extra strong (xxs) in 17 sizes, from NPS 1/2 through NPS 12. Wall thickness runs from 0.294 in (7.5 mm) at the small end to 1.000 in (25.4 mm) at the large end.
Does double extra strong (xxs) 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.