1/2 inch Sch 40 pipe dimensions & weight
1/2 inch Sch 40 pipe (DN 15) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 1/2" (DN 15) |
| Schedule | Sch 40 |
| Outside diameter | 21.3 mm (0.839 in) |
| Wall thickness | 2.77 mm (0.109 in) |
| Inside diameter | 15.76 mm (0.620 in) |
| Weight — carbon steel | 1.27 kg/m · 0.85 lb/ft |
| Weight — SS 304 / SS 316 | 1.28 / 1.29 kg/m |
| 6 m length (CS) | 7.6 kg |
| 20 ft length (CS) | 7.7 kg |
| Flow area | 1.95 cm² |
| Water capacity | 0.195 L/m |
| Outer surface (painting) | 0.0669 m²/m |
| Approx. max. working pressure* | 345 bar (5,008 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 1/2": Sch 10S · Sch 80 · Sch 160 · XXS · all 1/2" schedules
Frequently asked questions
What is the ID of 1/2 inch Sch 40 pipe?
15.76 mm (0.620 in), with OD 21.3 mm and wall 2.77 mm.
What is the weight of 1/2 inch Sch 40 pipe?
1.27 kg/m (0.85 lb/ft) in carbon steel; 7.6 kg per 6 m length.
What pressure can 1/2 inch Sch 40 pipe take?
Roughly 345 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