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HOT ROLLED FLAT SPRING STEEL TOLERANCES |
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Width (b) | |
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Nominal Width (mm) | Limit Deviation (mm) |
50 < b ≤ 80 | ± 0.5 |
80 < b ≤ 100 | ± 0.6 |
100 < b ≤ 120 | ± 0.7 |
120 < b ≤ 150 | ± 0.8 |
Thickness (t) | |
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Nominal Width (mm) | Limit Deviation (mm) |
t ≤ 20 | ± 0.25 |
20 < t ≤ 40 | ± 0.30 |
40 < t ≤ 60 | ± 0.50 |
Linearity (q) |
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Tolerance of plane B |
q ≤ L’ nin % 0.2 |
Corner Radius for Profile C ( r ) |
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Tolerance |
± 2 |
Deviation from Linearity (Ub) | |
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Nominal Width (mm) | Tolerance (mm) |
t ≤ 20 | 0.5 |
20 < t ≤ 40 | 1.0 |
40 < t ≤ 60 | 1.5 |
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DIMENSION and SHAPE TOLERANCES |
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Profile A: Flat bar with round ends made of hot rolled spring steel.
Profile B: Flat bar with a half-rounded end, made of hot rolled spring steel.
Profile C: Flat bar made of hot-rolled spring steel with flat ends and rounded edges.
When checked for compliance with Linearity Chart 4, 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).
For profile C, the deviation from verticality must be measured as the difference (u) over the nominal width (b) according to figure 5.