NPS 1/4 Schedule 5 Pipe
0.540 in (13.7 mm) outside diameter on a 0.049 in (1.2 mm) wall, giving a 0.442 in (11.2 mm) bore and 0.26 lb/ft (0.38 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 1/4 (DN 8)
- Schedule
- Schedule 5
- Outside diameter
- 0.540 in (13.7 mm)
- Wall thickness
- 0.049 in (1.2 mm)
- Inside diameter
- 0.442 in (11.2 mm)
- Weight, empty
- 0.26 lb/ft (0.38 kg/m)
- Weight, water filled
- 0.32 lb/ft (0.48 kg/m)
- Flow area
- 0.153 in² (99 mm²)
No other designation in NPS 1/4 shares this wall thickness, so Schedule 5 is unambiguous in this size.
Every schedule in NPS 1/4
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Water (US gal/ft) |
|---|---|---|---|---|
| Sch 5 this page | 0.0491.24 mm | 0.44211.23 mm | 0.260.38 kg/m | 0.008 |
| Sch 10 | 0.0651.65 mm | 0.41010.41 mm | 0.330.49 kg/m | 0.007 |
| Sch 40 | 0.0882.24 mm | 0.3649.25 mm | 0.420.63 kg/m | 0.005 |
| STD | 0.0882.24 mm | 0.3649.25 mm | 0.420.63 kg/m | 0.005 |
| Sch 80 | 0.1193.02 mm | 0.3027.67 mm | 0.540.80 kg/m | 0.004 |
| XS | 0.1193.02 mm | 0.3027.67 mm | 0.540.80 kg/m | 0.004 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Common questions
What is the inside diameter of NPS 1/4 schedule 5 pipe?
0.442 in (11.2 mm). The outside diameter is fixed at 0.540 in (13.7 mm) by ASME B36.10M, and the 0.049 in (1.2 mm) wall takes 0.098 in off it — 0.049 in from each side — leaving that bore.
How much does NPS 1/4 schedule 5 pipe weigh?
0.26 lb/ft (0.38 kg/m) empty, as plain-end carbon steel. Full of water it comes to 0.32 lb/ft (0.48 kg/m), because the bore holds 0.008 US gallons per foot. One short ton of this pipe is about 7783 ft.
Does NPS 1/4 schedule 5 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 1/4 hardware fits this pipe in any schedule. The one thing that does follow the schedule is the bore of a weld neck flange or a fitting end prep, which has to be 0.442 in (11.2 mm) to match.