3-1/2 inch Sch 40 pipe dimensions & weight
3-1/2 inch Sch 40 pipe (DN 90) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 3-1/2" (DN 90) |
| Schedule | Sch 40 |
| Outside diameter | 101.6 mm (4.000 in) |
| Wall thickness | 5.74 mm (0.226 in) |
| Inside diameter | 90.12 mm (3.548 in) |
| Weight — carbon steel | 13.57 kg/m · 9.12 lb/ft |
| Weight — SS 304 / SS 316 | 13.71 / 13.79 kg/m |
| 6 m length (CS) | 81.4 kg |
| 20 ft length (CS) | 82.7 kg |
| Flow area | 63.79 cm² |
| Water capacity | 6.379 L/m |
| Outer surface (painting) | 0.3192 m²/m |
| Approx. max. working pressure* | 142 bar (2,059 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 3-1/2": Sch 10S · Sch 80 · all 3-1/2" schedules
Frequently asked questions
What is the ID of 3-1/2 inch Sch 40 pipe?
90.12 mm (3.548 in), with OD 101.6 mm and wall 5.74 mm.
What is the weight of 3-1/2 inch Sch 40 pipe?
13.57 kg/m (9.12 lb/ft) in carbon steel; 81.4 kg per 6 m length.
What pressure can 3-1/2 inch Sch 40 pipe take?
Roughly 142 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