Hex bar weight calculator and hexagon bar weight chart.
Hex bar weight (kg/m) = AF² × 0.006798 for mild steel, where AF is the size across flats in mm. A 25 mm MS hex bar weighs 4.25 kg/m and a 6 m length weighs 25.5 kg. Use AF² × 0.006868 for SS 304 and AF² × 0.007361 for brass.
Theoretical weight from nominal size and density. Actual weight varies within mill tolerances.
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Hex bar weight chart (kg per metre)
Theoretical weight of hexagon bar by size across flats (AF): MS 7.85, SS 304 7.93, brass 8.50 and aluminium 2.70 g/cm³.
| Across flats | Across corners, mm | MS kg/m | MS 6 m length, kg | SS 304 kg/m | Brass kg/m | Aluminium kg/m |
|---|---|---|---|---|---|---|
| 6 mm | 6.9 | 0.245 | 1.47 | 0.247 | 0.265 | 0.084 |
| 8 mm | 9.2 | 0.435 | 2.61 | 0.440 | 0.471 | 0.150 |
| 10 mm | 11.5 | 0.680 | 4.08 | 0.687 | 0.736 | 0.234 |
| 11 mm | 12.7 | 0.823 | 4.94 | 0.831 | 0.891 | 0.283 |
| 12 mm | 13.9 | 0.979 | 5.87 | 0.989 | 1.060 | 0.337 |
| 13 mm | 15.0 | 1.149 | 6.89 | 1.161 | 1.244 | 0.395 |
| 14 mm | 16.2 | 1.332 | 7.99 | 1.346 | 1.443 | 0.458 |
| 16 mm | 18.5 | 1.740 | 10.44 | 1.758 | 1.884 | 0.599 |
| 17 mm | 19.6 | 1.965 | 11.79 | 1.985 | 2.127 | 0.676 |
| 19 mm | 21.9 | 2.454 | 14.73 | 2.479 | 2.657 | 0.844 |
| 20 mm | 23.1 | 2.719 | 16.32 | 2.747 | 2.944 | 0.935 |
| 22 mm | 25.4 | 3.290 | 19.74 | 3.324 | 3.563 | 1.132 |
| 24 mm | 27.7 | 3.916 | 23.49 | 3.956 | 4.240 | 1.347 |
| 25 mm | 28.9 | 4.249 | 25.49 | 4.292 | 4.601 | 1.461 |
| 27 mm | 31.2 | 4.956 | 29.74 | 5.006 | 5.366 | 1.705 |
| 28 mm | 32.3 | 5.330 | 31.98 | 5.384 | 5.771 | 1.833 |
| 30 mm | 34.6 | 6.118 | 36.71 | 6.181 | 6.625 | 2.104 |
| 32 mm | 37.0 | 6.961 | 41.77 | 7.032 | 7.538 | 2.394 |
| 36 mm | 41.6 | 8.811 | 52.86 | 8.900 | 9.540 | 3.030 |
| 38 mm | 43.9 | 9.817 | 58.90 | 9.917 | 10.630 | 3.376 |
| 40 mm | 46.2 | 10.877 | 65.26 | 10.988 | 11.778 | 3.741 |
| 41 mm | 47.3 | 11.428 | 68.57 | 11.544 | 12.374 | 3.931 |
| 45 mm | 52.0 | 13.767 | 82.60 | 13.907 | 14.906 | 4.735 |
| 46 mm | 53.1 | 14.385 | 86.31 | 14.532 | 15.576 | 4.948 |
| 50 mm | 57.7 | 16.996 | 101.97 | 17.169 | 18.403 | 5.846 |
| 55 mm | 63.5 | 20.565 | 123.39 | 20.774 | 22.268 | 7.073 |
| 60 mm | 69.3 | 24.474 | 146.84 | 24.723 | 26.500 | 8.418 |
| 65 mm | 75.1 | 28.723 | 172.34 | 29.016 | 31.101 | 9.879 |
| 70 mm | 80.8 | 33.312 | 199.87 | 33.651 | 36.070 | 11.458 |
| 75 mm | 86.6 | 38.240 | 229.44 | 38.630 | 41.407 | 13.153 |
| 80 mm | 92.4 | 43.509 | 261.05 | 43.953 | 47.112 | 14.965 |
| 90 mm | 103.9 | 55.066 | 330.40 | 55.627 | 59.626 | 18.940 |
| 100 mm | 115.5 | 67.983 | 407.90 | 68.676 | 73.612 | 23.383 |
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.
Frequently asked questions
What is the hex bar weight formula?
Weight per metre (kg) = 0.866 × AF² × density / 1000, with AF (across flats) in mm. For mild steel this is AF² × 0.006798, for SS 304 AF² × 0.006868, for brass AF² × 0.007361 and for aluminium AF² × 0.002338.
What is the weight of a 19 mm hex bar?
2.45 kg/m in mild steel and 2.48 kg/m in SS 304.
What is the weight of a 22 mm brass hex bar?
About 3.56 kg per metre at 8.50 g/cm³.
Is a hex bar sized across flats or across corners?
Across flats (AF), the distance between two opposite flat faces. Across corners is about 1.155 × AF.
Can I enter across-corners size as hex-bar across flats?
No. For a regular hexagon, across flats equals across corners × √3/2. Using corner size as the flat size overestimates area and weight. Confirm which dimension the drawing specifies.