Box section weight chart
Nominal weight per metre of square and rectangular hollow sections by wall thickness. A 6 m length is six times the table figure.
Weight per metre (kg) by wall thickness (mm)
| 20×20 | 0.87 | 1.13 | 1.37 | 1.60 | 2.01 | Box section 20×20 price |
|---|---|---|---|---|---|---|
| 25×25 | 1.11 | 1.44 | 1.77 | 2.07 | 2.64 | — |
| 30×30 | 1.34 | 1.76 | 2.16 | 2.54 | 3.27 | — |
| 40×20 | 1.34 | 1.76 | 2.16 | 2.54 | 3.27 | — |
| 40×40 | 1.81 | 2.39 | 2.94 | 3.48 | 4.52 | Box section 40×40 price |
| 50×25 | 1.70 | 2.23 | 2.75 | 3.25 | 4.21 | — |
| 50×50 | 2.28 | 3.01 | 3.73 | 4.43 | 5.78 | — |
| 60×30 | 2.05 | 2.70 | 3.34 | 3.96 | 5.15 | — |
| 60×40 | 2.28 | 3.01 | 3.73 | 4.43 | 5.78 | — |
| 60×60 | 2.75 | 3.64 | 4.51 | 5.37 | 7.03 | — |
| 70×70 | 3.23 | 4.27 | 5.30 | 6.31 | 8.29 | — |
| 80×40 | 2.75 | 3.64 | 4.51 | 5.37 | 7.03 | Box section 80×40 price |
| 80×80 | 3.70 | 4.90 | 6.08 | 7.25 | 9.55 | — |
| 100×50 | 3.46 | 4.58 | 5.69 | 6.78 | 8.92 | — |
| 100×100 | 4.64 | 6.15 | 7.65 | 9.14 | 12.06 | — |
Nominal weights from (2(a + b) − 4t) × t × 7.85 ÷ 1000 for sharp corners. Rounded corners and rolling tolerance make real bars slightly lighter, and each mill’s weight differs; the price tables list every product’s actual weight.
Frequently asked questions
How much does a 20×20 box section with a 1.5 mm wall weigh?
About 0.87 kg per metre nominal, so a 6 m length is about 5.2 kg.
How much does a 30×30 box section with a 1.5 mm wall weigh?
About 1.34 kg per metre nominal, so a 6 m length is about 8.1 kg.
How much does a 40×40 box section with a 2 mm wall weigh?
About 2.39 kg per metre nominal, so a 6 m length is about 14.3 kg.
How much does a 50×50 box section with a 2 mm wall weigh?
About 3.01 kg per metre nominal, so a 6 m length is about 18.1 kg.
How much does a 80×40 box section with a 2 mm wall weigh?
About 3.64 kg per metre nominal, so a 6 m length is about 21.9 kg.
How much does a 60×60 box section with a 3 mm wall weigh?
About 5.37 kg per metre nominal, so a 6 m length is about 32.2 kg.
How much does a 100×100 box section with a 3 mm wall weigh?
About 9.14 kg per metre nominal, so a 6 m length is about 54.8 kg.
How is box section weight calculated?
Weight per metre = (2(a + b) − 4t) × t × 7.85 ÷ 1000, with sides a, b and wall t in mm. For 40×40×2: (160 − 8) × 2 × 7.85 ÷ 1000 = 2.386 kg.