Normal bending tolerances for single radius bends are in line with those specified in the National Structural Steelwork Specification.
There are large numbers or standard sections (each with different bending characteristics), there are different methods of bending (hot and cold), and the end-uses vary widely.
COLUMN X-X
COLUMN X-X
RHS Y-Y
SHS
| Diameter | Tolerance |
| Up To 500 | DIA +/- 2.0mm |
| 500 to 1000 | DIA +/- 2.5mm |
| 1000 to 2000 | DIA +/- 4.0mm |
| 2000 to 6000 | DIA +/- 6.0mm |
| Over 6000 |
+/- DIA 1000mm |
| Max Deviation – L/1000 or 6mm whichever is greater |