NPS 4 Pipe Dimensions
Outside diameter 4.500 in (114.3 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 4
- Metric designator
- DN 100
- Outside diameter
- 4.500 in (114.3 mm)
- Schedules listed
- 9
- Standard weight wall
- 0.237 in (6.0 mm)
- Extra strong wall
- 0.337 in (8.6 mm)
Every schedule in NPS 4
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 | 0.0832.11 mm | 4.334110.08 mm | 3.925.83 kg/m | 14.75 | 0.766 |
| Sch 10 | 0.1203.05 mm | 4.260108.20 mm | 5.618.35 kg/m | 14.25 | 0.740 |
| Sch 40 | 0.2376.02 mm | 4.026102.26 mm | 10.7916.06 kg/m | 12.73 | 0.661 |
| STD | 0.2376.02 mm | 4.026102.26 mm | 10.7916.06 kg/m | 12.73 | 0.661 |
| Sch 80 | 0.3378.56 mm | 3.82697.18 mm | 14.9822.30 kg/m | 11.50 | 0.597 |
| XS | 0.3378.56 mm | 3.82697.18 mm | 14.9822.30 kg/m | 11.50 | 0.597 |
| Sch 120 | 0.43811.13 mm | 3.62492.05 mm | 19.0028.28 kg/m | 10.31 | 0.536 |
| Sch 160 | 0.53113.49 mm | 3.43887.33 mm | 22.5133.50 kg/m | 9.28 | 0.482 |
| XXS | 0.67417.12 mm | 3.15280.06 mm | 27.5440.99 kg/m | 7.80 | 0.405 |
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 4 pipe?
NPS 4 pipe has an outside diameter of 4.500 in (114.3 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 4 schedule 40 pipe weigh?
10.79 lb/ft (16.06 kg/m) as plain-end carbon steel, on a wall thickness of 0.237 in (6.0 mm).
What is the metric equivalent of NPS 4?
DN 100. DN is a dimensionless designator, not a measurement — DN 100 pipe does not measure 100 mm anywhere. Its actual outside diameter is 114.3 mm.