4 inch (DN 100) pipe dimensions & weight
4 inch (DN 100) steel pipe has an outside diameter of 114.3 mm (4.500 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 | 2.11 | 0.083 | 110.08 | 5.84 | 3.92 | 5.90 | 9.52 |
| Sch 10S | 3.05 | 0.120 | 108.20 | 8.37 | 5.62 | 8.46 | 9.19 |
| STD | 6.02 | 0.237 | 102.26 | 16.07 | 10.80 | 16.23 | 8.21 |
| Sch 40 | 6.02 | 0.237 | 102.26 | 16.07 | 10.80 | 16.23 | 8.21 |
| XS | 8.56 | 0.337 | 97.18 | 22.32 | 15.00 | 22.55 | 7.42 |
| Sch 80 | 8.56 | 0.337 | 97.18 | 22.32 | 15.00 | 22.55 | 7.42 |
| Sch 120 | 11.13 | 0.438 | 92.04 | 28.32 | 19.03 | 28.61 | 6.65 |
| Sch 160 | 13.49 | 0.531 | 87.32 | 33.54 | 22.54 | 33.88 | 5.99 |
| XXS | 17.12 | 0.674 | 80.06 | 41.03 | 27.57 | 41.45 | 5.03 |
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 4" flanges and fittings
| Class 150 flange | OD 230 mm · thk 22.3 mm · PCD 190.5 mm · 8 × 5/8" bolts |
| Class 300 flange | OD 255 mm · thk 30.2 mm · PCD 200.0 mm · 8 × 3/4" bolts |
| B16.9 fittings | 90° LR 152 mm · 45° LR 64 mm · 90° SR 102 mm · tee 105 mm · reducer 102 mm · cap 64 mm |
Full tables: Class 150 · Class 300 · B16.9 fittings.
Frequently asked questions
What is the OD of 4 inch pipe?
4 inch (DN 100) pipe has an outside diameter of 114.3 mm (4.500 in), regardless of schedule.
What is the wall thickness of 4 inch Schedule 40 pipe?
6.02 mm (0.237 in), giving an inside diameter of 102.26 mm.
How much does 4 inch Schedule 40 pipe weigh?
About 16.07 kg/m (10.80 lb/ft) in carbon steel, or 96.4 kg for a 6 m length.
What is the wall thickness of 4 inch Schedule 80 pipe?
8.56 mm, with an inside diameter of 97.18 mm and weight of 22.32 kg/m.
Last updated 2026-11-02