NPS 5 Pipe Dimensions
Outside diameter 5.563 in (141.3 mm) — fixed across every schedule. 9 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 5
- Metric designator
- DN 125
- Outside diameter
- 5.563 in (141.3 mm)
- Schedules listed
- 9
- Standard weight wall
- 0.258 in (6.6 mm)
- Extra strong wall
- 0.375 in (9.5 mm)
Every schedule in NPS 5
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Flow area (in²) | Water (US gal/ft) |
|---|---|---|---|---|---|
| Sch 5 | 0.1092.77 mm | 5.345135.76 mm | 6.359.45 kg/m | 22.44 | 1.166 |
| Sch 10 | 0.1343.40 mm | 5.295134.49 mm | 7.7711.56 kg/m | 22.02 | 1.144 |
| Sch 40 | 0.2586.55 mm | 5.047128.19 mm | 14.6221.75 kg/m | 20.01 | 1.039 |
| STD | 0.2586.55 mm | 5.047128.19 mm | 14.6221.75 kg/m | 20.01 | 1.039 |
| Sch 80 | 0.3759.52 mm | 4.813122.25 mm | 20.7830.92 kg/m | 18.19 | 0.945 |
| XS | 0.3759.52 mm | 4.813122.25 mm | 20.7830.92 kg/m | 18.19 | 0.945 |
| Sch 120 | 0.50012.70 mm | 4.563115.90 mm | 27.0440.24 kg/m | 16.35 | 0.849 |
| Sch 160 | 0.62515.88 mm | 4.313109.55 mm | 32.9649.05 kg/m | 14.61 | 0.759 |
| XXS | 0.75019.05 mm | 4.063103.20 mm | 38.5557.37 kg/m | 12.97 | 0.674 |
Weight is calculated for carbon steel as w = 10.6802 × t × (OD − t) lb/ft and is the plain-end weight, excluding coatings, linings and fittings.
Standard weight equals Schedule 40 in this size. Extra strong equals Schedule 80.
This size, schedule by schedule
A page for each combination, with bore, weight, water capacity and the matching flange and fitting data.
This size in a schedule chart
Common questions
What is the outside diameter of NPS 5 pipe?
NPS 5 pipe has an outside diameter of 5.563 in (141.3 mm). That outside diameter is fixed: it is identical in every schedule, and only the wall thickness — and therefore the bore — changes from one schedule to the next.
How much does NPS 5 schedule 40 pipe weigh?
14.62 lb/ft (21.75 kg/m) as plain-end carbon steel, on a wall thickness of 0.258 in (6.6 mm).
What is the metric equivalent of NPS 5?
DN 125. DN is a dimensionless designator, not a measurement — DN 125 pipe does not measure 125 mm anywhere. Its actual outside diameter is 141.3 mm.