1 inch Sch 40 pipe dimensions & weight
1 inch Sch 40 pipe (DN 25) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 1" (DN 25) |
| Schedule | Sch 40 |
| Outside diameter | 33.4 mm (1.315 in) |
| Wall thickness | 3.38 mm (0.133 in) |
| Inside diameter | 26.64 mm (1.049 in) |
| Weight — carbon steel | 2.50 kg/m · 1.68 lb/ft |
| Weight — SS 304 / SS 316 | 2.53 / 2.54 kg/m |
| 6 m length (CS) | 15.0 kg |
| 20 ft length (CS) | 15.2 kg |
| Flow area | 5.57 cm² |
| Water capacity | 0.557 L/m |
| Outer surface (painting) | 0.1049 m²/m |
| Approx. max. working pressure* | 263 bar (3,812 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": Sch 10S · Sch 80 · Sch 160 · XXS · all 1" schedules
Frequently asked questions
What is the ID of 1 inch Sch 40 pipe?
26.64 mm (1.049 in), with OD 33.4 mm and wall 3.38 mm.
What is the weight of 1 inch Sch 40 pipe?
2.50 kg/m (1.68 lb/ft) in carbon steel; 15.0 kg per 6 m length.
What pressure can 1 inch Sch 40 pipe take?
Roughly 263 bar at ambient for seamless A106 Gr B under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code.
Last updated 2026-11-02