Preferred sizes, mass and size tolerances of hot rolled square bars for general purposes
| Size $ a $ , in $ \mathrm{mm} $ | Limit deviation, in $ \mathrm{mm} $ | Mass per unit length $ M $ , in $ \mathrm{kg/m} $ | Cross-sectional area $ A $ , in $ \mathrm{cm^2} $ |
|---|---|---|---|
| 8 | ±0.4 | 0.502 | 0.64 |
| 10 | ±0.4 | 0.785 | 1.00 |
| 12 | ±0.4 | 1.13 | 1.44 |
| 13 | ±0.4 | 1.33 | 1.69 |
| 14 | ±0.4 | 1.54 | 1.96 |
| 15 | ±0.5 | 1.77 | 2.25 |
| 16 | ±0.5 | 2.01 | 2.56 |
| 18 | ±0.5 | 2.54 | 3.24 |
| 20 | ±0.5 | 3.14 | 4.00 |
| 22 | ±0.5 | 3.80 | 4.84 |
| 24 | ±0.5 | 4.52 | 5.76 |
| 25 | ±0.5 | 4.91 | 6.25 |
| 26 | ±0.6 | 5.31 | 6.76 |
| 28 | ±0.6 | 6.15 | 7.84 |
| 30 | ±0.6 | 7.07 | 9.00 |
| 32 | ±0.6 | 8.04 | 10.2 |
| 35 | ±0.6 | 9.62 | 12.3 |
| 40 | ±0.8 | 12.6 | 16.0 |
| 45 | ±0.8 | 15.9 | 20.3 |
| 50 | ±0.8 | 19.6 | 25.0 |
| 55 | ±1.0 | 23.7 | 30.3 |
| 60 | ±1.0 | 28.3 | 36.0 |
| 65 | ±1.0 | 33.2 | 42.3 |
| 70 | ±1.0 | 38.5 | 49.0 |
| 75 | ±1.0 | 44.2 | 56.3 |
| 80 | ±1.0 | 50.2 | 64.0 |
| 90 | ±1.0 | 63.6 | 81.0 |
| 100 | ±1.3 | 78.5 | 100 |
| 110 | ±1.5 | 95.0 | 121 |
| 120 | ±1.5 | 113 | 144 |
| 130 | ±1.8 | 133 | 169 |
| 140 | ±1.8 | 154 | 196 |
| 150 | ±1.8 | 177 | 225 |
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