1/2 inch (DN 15) pipe dimensions & weight
1/2 inch (DN 15) steel pipe has an outside diameter of 21.3 mm (0.839 in) in every schedule. Below: wall thickness, inside diameter, weight per metre and water capacity for each ASME B36.10M / B36.19M schedule.
| Schedule | Wall (mm) | Wall (in) | ID (mm) | CS kg/m | CS lb/ft | SS 304 kg/m | Water L/m |
|---|---|---|---|---|---|---|---|
| Sch 5S | 1.65 | 0.065 | 18.00 | 0.80 | 0.54 | 0.81 | 0.25 |
| Sch 10S | 2.11 | 0.083 | 17.08 | 1.00 | 0.67 | 1.01 | 0.23 |
| STD | 2.77 | 0.109 | 15.76 | 1.27 | 0.85 | 1.28 | 0.20 |
| Sch 40 | 2.77 | 0.109 | 15.76 | 1.27 | 0.85 | 1.28 | 0.20 |
| XS | 3.73 | 0.147 | 13.84 | 1.62 | 1.09 | 1.64 | 0.15 |
| Sch 80 | 3.73 | 0.147 | 13.84 | 1.62 | 1.09 | 1.64 | 0.15 |
| Sch 160 | 4.78 | 0.188 | 11.74 | 1.95 | 1.31 | 1.97 | 0.11 |
| XXS | 7.47 | 0.294 | 6.36 | 2.55 | 1.71 | 2.58 | 0.03 |
CS = carbon steel (7.85 g/cm³). SS 304 at 7.93 g/cm³; for 316 multiply CS weight by 1.017. Water capacity = internal volume per metre.
Matching 1/2" flanges and fittings
| Class 150 flange | OD 90 mm · thk 9.6 mm · PCD 60.3 mm · 4 × 1/2" bolts |
| Class 300 flange | OD 95 mm · thk 12.7 mm · PCD 66.7 mm · 4 × 1/2" bolts |
| B16.9 fittings | 90° LR 38 mm · 45° LR 16 mm · tee 25 mm · cap 25 mm |
Full tables: Class 150 · Class 300 · B16.9 fittings.
Frequently asked questions
What is the OD of 1/2 inch pipe?
1/2 inch (DN 15) pipe has an outside diameter of 21.3 mm (0.839 in), regardless of schedule.
What is the wall thickness of 1/2 inch Schedule 40 pipe?
2.77 mm (0.109 in), giving an inside diameter of 15.76 mm.
How much does 1/2 inch Schedule 40 pipe weigh?
About 1.27 kg/m (0.85 lb/ft) in carbon steel, or 7.6 kg for a 6 m length.
What is the wall thickness of 1/2 inch Schedule 80 pipe?
3.73 mm, with an inside diameter of 13.84 mm and weight of 1.62 kg/m.
Last updated 2026-11-02