3/4 inch Sch 40 pipe dimensions & weight
3/4 inch Sch 40 pipe (DN 20) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 3/4" (DN 20) |
| Schedule | Sch 40 |
| Outside diameter | 26.7 mm (1.051 in) |
| Wall thickness | 2.87 mm (0.113 in) |
| Inside diameter | 20.96 mm (0.825 in) |
| Weight — carbon steel | 1.69 kg/m · 1.14 lb/ft |
| Weight — SS 304 / SS 316 | 1.71 / 1.72 kg/m |
| 6 m length (CS) | 10.1 kg |
| 20 ft length (CS) | 10.3 kg |
| Flow area | 3.45 cm² |
| Water capacity | 0.345 L/m |
| Outer surface (painting) | 0.0839 m²/m |
| Approx. max. working pressure* | 281 bar (4,068 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 3/4": Sch 10S · Sch 80 · Sch 160 · XXS · all 3/4" schedules
Frequently asked questions
What is the ID of 3/4 inch Sch 40 pipe?
20.96 mm (0.825 in), with OD 26.7 mm and wall 2.87 mm.
What is the weight of 3/4 inch Sch 40 pipe?
1.69 kg/m (1.14 lb/ft) in carbon steel; 10.1 kg per 6 m length.
What pressure can 3/4 inch Sch 40 pipe take?
Roughly 281 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