Steel pipe is used for water lines, frames, posts, fences, and industrial installations. When ordering, two things matter most: the size (diameter & wall thickness) and the weight per metre — because pipe is sold by the kilogram. This article summarises the full ERW steel pipe table across Light, Medium, and Heavy classes.
Understanding pipe sizes: inch, nominal, and OD
Pipe is described by three numbers that often cause confusion:
- Inch / nominal (e.g. 1”, DN25) — the size name, not the real diameter.
- OD (Outside Diameter) — the actual outer diameter in mm.
- Wall thickness — defines the class: thicker wall, stronger and heavier pipe.
ERW (Electric Resistance Welded) pipe comes in three thickness classes: Light, Medium, and Heavy, following SNI 0039:2013 / ASTM A53.
ERW steel pipe weight table (kg/m)
| Inch | OD (mm) | Light | Medium | Heavy |
|---|---|---|---|---|
| ½” | 21.3 | 0.947 | 1.21 | 1.44 |
| ¾” | 26.8 | 1.38 | 1.56 | 1.87 |
| 1” | 33.7 | 1.98 | 2.41 | 2.94 |
| 1¼” | 42.4 | 2.54 | 3.10 | 3.80 |
| 1½” | 48.3 | 3.23 | 3.56 | 4.38 |
| 2” | 60.3 | 4.08 | 5.03 | 6.19 |
| 2½” | 76.1 | 5.71 | 6.42 | 7.93 |
| 3” | 88.9 | 6.72 | 8.36 | 10.3 |
| 4” | 114.3 | 9.75 | 12.2 | 15.99 |
| 5” | 139.7 | — | 16.6 | 21.92 |
| 6” | 168.3 | — | 19.8 | 28.22 |
| 8” | 219.1 | — | 33.32 | 42.65 |
The kg/m figures already account for each class’s OD and wall thickness. The standard pipe length is 6 m — multiply kg/m by 6 for the weight per length.
Example: a 2” Medium pipe = 5.03 kg/m × 6 m = 30.2 kg per length.
ERW vs seamless pipe (SCH 40/80)
Besides ERW (welded), seamless pipe is also available in schedules SCH 40, SCH 80, and SCH 160 for high-pressure use — common in oil & gas and industrial projects. The full SCH tables are on our pipe product page.
Need a steel pipe price today?
Marselus Steel keeps ERW and seamless steel pipe in ready stock at our Tipar Cakung warehouse, North Jakarta. Contact our team on WhatsApp for a quote and Greater Jakarta delivery.
