1/4 inch Sch 40 pipe dimensions & weight
1/4 inch Sch 40 pipe (DN 8) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 1/4" (DN 8) |
| Schedule | Sch 40 |
| Outside diameter | 13.7 mm (0.539 in) |
| Wall thickness | 2.24 mm (0.088 in) |
| Inside diameter | 9.22 mm (0.363 in) |
| Weight — carbon steel | 0.63 kg/m · 0.42 lb/ft |
| Weight — SS 304 / SS 316 | 0.64 / 0.64 kg/m |
| 6 m length (CS) | 3.8 kg |
| 20 ft length (CS) | 3.8 kg |
| Flow area | 0.67 cm² |
| Water capacity | 0.067 L/m |
| Outer surface (painting) | 0.0430 m²/m |
| Approx. max. working pressure* | 446 bar (6,462 psi) — A106 Gr B |
*Approximate ASME B31.3 straight-pipe rating at ≤ 38 °C for seamless A106 Gr B (S = 137.9 MPa, E = 1, 12.5% mill tolerance, no corrosion allowance). Use the wall thickness calculator for your own design conditions.
Other schedules for 1/4": Sch 10S · Sch 80 · all 1/4" schedules
Frequently asked questions
What is the ID of 1/4 inch Sch 40 pipe?
9.22 mm (0.363 in), with OD 13.7 mm and wall 2.24 mm.
What is the weight of 1/4 inch Sch 40 pipe?
0.63 kg/m (0.42 lb/ft) in carbon steel; 3.8 kg per 6 m length.
What pressure can 1/4 inch Sch 40 pipe take?
Roughly 446 bar at ambient for seamless A106 Gr B under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code.
By Piping Supply Journal Editorial Team · Published · Last updated