1/4 inch (DN 8) pipe dimensions & weight
1/4 inch (DN 8) steel pipe has an outside diameter of 13.7 mm (0.539 in) in every schedule. Below: wall thickness, inside diameter, weight per metre and water capacity for each ASME B36.10M / B36.19M schedule.
| Schedule | Wall (mm) | Wall (in) | ID (mm) | CS kg/m | CS lb/ft | SS 304 kg/m | Water L/m |
|---|---|---|---|---|---|---|---|
| Sch 10S | 1.65 | 0.065 | 10.40 | 0.49 | 0.33 | 0.49 | 0.08 |
| STD | 2.24 | 0.088 | 9.22 | 0.63 | 0.42 | 0.64 | 0.07 |
| Sch 40 | 2.24 | 0.088 | 9.22 | 0.63 | 0.42 | 0.64 | 0.07 |
| XS | 3.02 | 0.119 | 7.66 | 0.80 | 0.54 | 0.81 | 0.05 |
| Sch 80 | 3.02 | 0.119 | 7.66 | 0.80 | 0.54 | 0.81 | 0.05 |
CS = carbon steel (7.85 g/cm³). SS 304 at 7.93 g/cm³; for 316 multiply CS weight by 1.017. Water capacity = internal volume per metre.
Frequently asked questions
What is the OD of 1/4 inch pipe?
1/4 inch (DN 8) pipe has an outside diameter of 13.7 mm (0.539 in), regardless of schedule.
What is the wall thickness of 1/4 inch Schedule 40 pipe?
2.24 mm (0.088 in), giving an inside diameter of 9.22 mm.
How much does 1/4 inch Schedule 40 pipe weigh?
About 0.63 kg/m (0.42 lb/ft) in carbon steel, or 3.8 kg for a 6 m length.
What is the wall thickness of 1/4 inch Schedule 80 pipe?
3.02 mm, with an inside diameter of 7.66 mm and weight of 0.80 kg/m.
Last updated 2026-11-02