EN 10279 and GB/T 706 have nearly identical tolerances:
| Dimension | Size Range | EN 10279 Tolerance | GB/T 706 Tolerance | Impact |
|---|---|---|---|---|
| Depth | 100–200 mm | ±1.0 mm | ±1.0 mm | Identical-no fit issues. |
| Depth | 201–300 mm | ±1.5 mm | ±1.5 mm | Consistent bending capacity. |
| Flange Width | 80–150 mm | ±0.8 mm | ±0.8 mm | Bolt holes align perfectly. |
| Web Thickness | 5–10 mm | ±0.4 mm | ±0.4 mm | Same shear capacity. |
| Length | 6–12 m | ±50 mm | ±50 mm | Easy on-site cutting. |
This alignment ensures EN I-beams integrate into GB designs without modifications.