4 inch Sch 40 pipe dimensions & weight
4 inch Sch 40 pipe (DN 100) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 4" (DN 100) |
| Schedule | Sch 40 |
| Outside diameter | 114.3 mm (4.500 in) |
| Wall thickness | 6.02 mm (0.237 in) |
| Inside diameter | 102.26 mm (4.026 in) |
| Weight — carbon steel | 16.07 kg/m · 10.80 lb/ft |
| Weight — SS 304 / SS 316 | 16.23 / 16.34 kg/m |
| 6 m length (CS) | 96.4 kg |
| 20 ft length (CS) | 98.0 kg |
| Flow area | 82.13 cm² |
| Water capacity | 8.213 L/m |
| Outer surface (painting) | 0.3591 m²/m |
| Approx. max. working pressure* | 132 bar (1,914 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 4": Sch 10S · Sch 80 · Sch 160 · XXS · all 4" schedules
Frequently asked questions
What is the ID of 4 inch Sch 40 pipe?
102.26 mm (4.026 in), with OD 114.3 mm and wall 6.02 mm.
What is the weight of 4 inch Sch 40 pipe?
16.07 kg/m (10.80 lb/ft) in carbon steel; 96.4 kg per 6 m length.
What pressure can 4 inch Sch 40 pipe take?
Roughly 132 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