1/4 inch pipe (DN 8): outside diameter, wall thickness and weight by schedule
A 1/4 inch pipe (DN 8) has a 13.7 mm (0.540 in) outside diameter in every schedule: what changes is the wall, and with it the inside diameter and the weight. Designations that give the same wall share a row.
| Schedule | Wall | ID | Weight |
|---|---|---|---|
| Sch 10 / 10S | 1.65 mm (0.065 in) | 10.40 mm (0.410 in) | 0.49 kg/m (0.33 lb/ft) |
| Sch 30 | 1.85 mm (0.073 in) | 10.00 mm (0.394 in) | 0.54 kg/m (0.36 lb/ft) |
| Sch 40 / STD / 40S | 2.24 mm (0.088 in) | 9.22 mm (0.364 in) | 0.63 kg/m (0.43 lb/ft) |
| Sch 80 / XS / 80S | 3.02 mm (0.119 in) | 7.66 mm (0.302 in) | 0.80 kg/m (0.54 lb/ft) |
| Sch 160 | 3.68 mm (0.145 in) | 6.34 mm (0.250 in) | 0.91 kg/m (0.61 lb/ft) |
| XXS | 6.05 mm (0.238 in) | 1.60 mm (0.064 in) | 1.14 kg/m (0.77 lb/ft) |
Plain-end weight of carbon steel pipe, by the standard's own formula: 10.69 × (D − t) × t in lb/ft, with D and t in inches (0.0246615 × (D − t) × t in kg/m, in mm). Austenitic stainless weighs about 2% more.
Lay out on 1/4 inch pipe
The outside diameter and the wall of the chosen schedule go to the calculator, which opens with them filled in and draws without an account.
Questions
- What is the outside diameter of 1/4 inch pipe?
- 13.7 mm (0.540 in), in any schedule: it is the DN 8 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
- What is the wall thickness of 1/4 inch schedule 40 pipe?
- 2.24 mm (0.088 in), with an inside diameter of 9.22 mm (0.364 in); carbon steel pipe weighs 0.63 kg/m (0.43 lb/ft).
- What is the difference between schedule 40 and 80 in 1/4 inch pipe?
- The wall: 2.24 mm (0.088 in) in schedule 40 and 3.02 mm (0.119 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 7.66 mm (0.302 in) against 9.22 mm (0.364 in) -- and weighs 0.80 kg/m (0.54 lb/ft) against 0.63 kg/m (0.43 lb/ft).