6 inch (DN 150) pipe dimensions & weight
6 inch (DN 150) steel pipe has an outside diameter of 168.3 mm (6.626 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 | 2.77 | 0.109 | 162.76 | 11.31 | 7.60 | 11.43 | 20.81 |
| Sch 10S | 3.40 | 0.134 | 161.50 | 13.83 | 9.29 | 13.97 | 20.48 |
| STD | 7.11 | 0.280 | 154.08 | 28.26 | 18.99 | 28.55 | 18.65 |
| Sch 40 | 7.11 | 0.280 | 154.08 | 28.26 | 18.99 | 28.55 | 18.65 |
| XS | 10.97 | 0.432 | 146.36 | 42.56 | 28.60 | 42.99 | 16.82 |
| Sch 80 | 10.97 | 0.432 | 146.36 | 42.56 | 28.60 | 42.99 | 16.82 |
| Sch 120 | 14.27 | 0.562 | 139.76 | 54.20 | 36.42 | 54.75 | 15.34 |
| Sch 160 | 18.26 | 0.719 | 131.78 | 67.56 | 45.40 | 68.25 | 13.64 |
| XXS | 21.95 | 0.864 | 124.40 | 79.22 | 53.24 | 80.03 | 12.15 |
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 6" flanges and fittings
| Class 150 flange | OD 280 mm · thk 23.9 mm · PCD 241.3 mm · 8 × 3/4" bolts |
| Class 300 flange | OD 320 mm · thk 35.0 mm · PCD 269.9 mm · 12 × 3/4" bolts |
| B16.9 fittings | 90° LR 229 mm · 45° LR 95 mm · 90° SR 152 mm · tee 143 mm · reducer 140 mm · cap 89 mm |
Full tables: Class 150 · Class 300 · B16.9 fittings.
Frequently asked questions
What is the OD of 6 inch pipe?
6 inch (DN 150) pipe has an outside diameter of 168.3 mm (6.626 in), regardless of schedule.
What is the wall thickness of 6 inch Schedule 40 pipe?
7.11 mm (0.280 in), giving an inside diameter of 154.08 mm.
How much does 6 inch Schedule 40 pipe weigh?
About 28.26 kg/m (18.99 lb/ft) in carbon steel, or 169.6 kg for a 6 m length.
What is the wall thickness of 6 inch Schedule 80 pipe?
10.97 mm, with an inside diameter of 146.36 mm and weight of 42.56 kg/m.
Last updated 2026-11-02