NPS 1/4 Schedule 10 Pipe
0.540 in (13.7 mm) outside diameter on a 0.065 in (1.7 mm) wall, giving a 0.410 in (10.4 mm) bore and 0.33 lb/ft (0.49 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 1/4 (DN 8)
- Schedule
- Schedule 10
- Outside diameter
- 0.540 in (13.7 mm)
- Wall thickness
- 0.065 in (1.7 mm)
- Inside diameter
- 0.410 in (10.4 mm)
- Weight, empty
- 0.33 lb/ft (0.49 kg/m)
- Weight, water filled
- 0.39 lb/ft (0.58 kg/m)
- Flow area
- 0.132 in² (85 mm²)
No other designation in NPS 1/4 shares this wall thickness, so Schedule 10 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 | 0.0491.24 mm | 0.44211.23 mm | 0.260.38 kg/m | 0.008 |
| Sch 10 this page | 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 10 pipe?
0.410 in (10.4 mm). The outside diameter is fixed at 0.540 in (13.7 mm) by ASME B36.10M, and the 0.065 in (1.7 mm) wall takes 0.130 in off it — 0.065 in from each side — leaving that bore.
How much does NPS 1/4 schedule 10 pipe weigh?
0.33 lb/ft (0.49 kg/m) empty, as plain-end carbon steel. Full of water it comes to 0.39 lb/ft (0.58 kg/m), because the bore holds 0.007 US gallons per foot. One short ton of this pipe is about 6065 ft.
Does NPS 1/4 schedule 10 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 0.410 in (10.4 mm) to match.