NPS 3/8 Pipe Dimensions
Outside diameter 0.675 in (17.1 mm) — fixed across every schedule. 6 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 3/8
- Metric designator
- DN 10
- Outside diameter
- 0.675 in (17.1 mm)
- Schedules listed
- 6
- Standard weight wall
- 0.091 in (2.3 mm)
- Extra strong wall
- 0.126 in (3.2 mm)
Every schedule in NPS 3/8
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 | 0.0491.24 mm | 0.57714.66 mm | 0.330.49 kg/m | 0.26 | 0.014 |
| Sch 10 | 0.0651.65 mm | 0.54513.84 mm | 0.420.63 kg/m | 0.23 | 0.012 |
| Sch 40 | 0.0912.31 mm | 0.49312.52 mm | 0.570.84 kg/m | 0.19 | 0.010 |
| STD | 0.0912.31 mm | 0.49312.52 mm | 0.570.84 kg/m | 0.19 | 0.010 |
| Sch 80 | 0.1263.20 mm | 0.42310.74 mm | 0.741.10 kg/m | 0.14 | 0.007 |
| XS | 0.1263.20 mm | 0.42310.74 mm | 0.741.10 kg/m | 0.14 | 0.007 |
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 3/8 pipe?
NPS 3/8 pipe has an outside diameter of 0.675 in (17.1 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 3/8 schedule 40 pipe weigh?
0.57 lb/ft (0.84 kg/m) as plain-end carbon steel, on a wall thickness of 0.091 in (2.3 mm).
What is the metric equivalent of NPS 3/8?
DN 10. DN is a dimensionless designator, not a measurement — DN 10 pipe does not measure 10 mm anywhere. Its actual outside diameter is 17.1 mm.