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| HOT ROLLED FLAT SPRING STEEL TOLERANCES |
|---|
| Width (b) | |
|---|---|
| Nominal Width (mm) | Deviation (mm) |
| 50 < b ≤ 80 | ± 0.5 |
| 80 < b ≤ 100 | ± 0.6 |
| 100 < b ≤ 120 | ± 0.7 |
| 120 < b ≤ 150 | ± 0.8 |
| Thickness (t) | |
|---|---|
| Nominal Width (mm) | Deviation (mm) |
| t ≤ 20 | ± 0.25 |
| 20 < t ≤ 40 | ± 0.30 |
| 40 < t ≤ 60 | ± 0.50 |
| Straightness (q) |
|---|
| Tolerance along bar length (L1) |
| q ≤ L’s % 0.2 |
| Corner Radius for Profile C (r) |
|---|
| Tolerance |
| ± 2 |
| Vertical Tolerance for Profile C (u) | |
|---|---|
| Nominal Width (mm) | Tolerance (mm) |
| t ≤ 20 | 0.5 |
| 20 < t ≤ 40 | 1.0 |
| 40 < t ≤ 60 | 1.5 |
| - | - |
| DIMENSION and SHAPE TOLERANCES |
|---|
Profile A / DIN 59145 / EN 10092-1A
Profile A: Flat bar with round ends made of hot rolled spring steel.
Profile B / DIN 4620 / EN 10092-1B
Profile B: Flat bar with a half-rounded end, made of hot rolled spring steel.
Profile C / DIN 59146 / EN 10092-1C
Profile C: Flat bar made of hot-rolled spring steel with flat ends and rounded edges.
Straightness
According to the tolerance table above, the q1 dimension should be measured along the total length of the bar (L1), after which the q2 dimension can be determined along any section of the bar with reference lengths of 100mm (L2).
Vertical Tolerance
For profile C, the deviation from verticality must be measured as the difference (u) over the nominal width (b) according to table above.