NPS 1/8 Schedule 80 Pipe
0.405 in (10.3 mm) outside diameter on a 0.095 in (2.4 mm) wall, giving a 0.215 in (5.5 mm) bore and 0.31 lb/ft (0.47 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 1/8 (DN 6)
- Schedule
- Schedule 80
- Outside diameter
- 0.405 in (10.3 mm)
- Wall thickness
- 0.095 in (2.4 mm)
- Inside diameter
- 0.215 in (5.5 mm)
- Weight, empty
- 0.31 lb/ft (0.47 kg/m)
- Weight, water filled
- 0.33 lb/ft (0.49 kg/m)
- Flow area
- 0.036 in² (23 mm²)
In NPS 1/8 this wall thickness is also designated Extra Strong (XS). That is the same pipe under another name, not a different product — but the coincidence is specific to this size and does not hold across the range.
Every schedule in NPS 1/8
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 | 0.0350.89 mm | 0.3358.51 mm | 0.140.21 kg/m | 0.005 |
| Sch 10 | 0.0491.24 mm | 0.3077.80 mm | 0.190.28 kg/m | 0.004 |
| Sch 40 | 0.0681.73 mm | 0.2696.83 mm | 0.240.36 kg/m | 0.003 |
| STD | 0.0681.73 mm | 0.2696.83 mm | 0.240.36 kg/m | 0.003 |
| Sch 80 this page | 0.0952.41 mm | 0.2155.46 mm | 0.310.47 kg/m | 0.002 |
| XS | 0.0952.41 mm | 0.2155.46 mm | 0.310.47 kg/m | 0.002 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Common questions
What is the inside diameter of NPS 1/8 schedule 80 pipe?
0.215 in (5.5 mm). The outside diameter is fixed at 0.405 in (10.3 mm) by ASME B36.10M, and the 0.095 in (2.4 mm) wall takes 0.190 in off it — 0.095 in from each side — leaving that bore.
How much does NPS 1/8 schedule 80 pipe weigh?
0.31 lb/ft (0.47 kg/m) empty, as plain-end carbon steel. Full of water it comes to 0.33 lb/ft (0.49 kg/m), because the bore holds 0.002 US gallons per foot. One short ton of this pipe is about 6359 ft.
Does NPS 1/8 schedule 80 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 1/8 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 0.215 in (5.5 mm) to match.