25 mm Reinforcing Bar - EN / Eurocode
25 mm is a EN / Eurocode reinforcing bar to EN 10080 / EN 1992-1-1. Its nominal diameter is 25 mm, giving a cross-section area As of 490.9 mm² and a mass of 3.853 kg/m. It is supplied in grade B500A / B500B / B500C with characteristic yield f_yk = 500 MPa. The tables below give the total steel area for 1-10 bars and the area per metre of width at common bar spacings.
Bar properties
| d | Nominal diameter | 25 mm |
| As | Cross-section area | 490.9 mm² |
| m | Mass per metre | 3.853 kg/m |
| u | Nominal perimeter | 78.5 mm |
| f_yk | Characteristic yield | 500 MPa |
Total area for n bars (As = n × 490.9 mm²)
| Bars | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| As (mm²) | 491 | 982 | 1,473 | 1,964 | 2,455 | 2,945 | 3,436 | 3,927 | 4,418 | 4,909 |
Area per metre at spacing (As/m = 1000/s × 490.9 mm²)
| s (mm) | 75 | 100 | 125 | 150 | 175 | 200 | 250 | 300 |
|---|---|---|---|---|---|---|---|---|
| As/m (mm²/m) | 6,545 | 4,909 | 3,927 | 3,273 | 2,805 | 2,455 | 1,964 | 1,636 |
Source: EN 10080 / EN 1992-1-1. Area = π/4 × d² for metric bars; ASTM areas are the standard's tabulated nominal values. Grades available: B500A, B500B, B500C.
Other EN / Eurocode bar sizes
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