Allowable tolerance of compression spring:
Item 3 ≤ D / d < 8 ≤ D / d < 15 d / D ≥ 15
Mean diameter (d) ± 1.5% (min ± 0.15) ± 2% (min ± 0.25) ± 3% (min ± 0.4)
Free length (L) ± 2% (min ± 0.4) ± 3% (min ± 0.5) ± 4% (min ± 0.8)
Spring factor (k) ± 6% ± 8% ± 10%
Load (P) load tolerance (kg) / spring factor (kg / mm) ≥ the above free length tolerance (mm) (minimum ± 5%) allowable
tolerance of tension spring
Item 4 ≤ D / d < 8 ≤ D / d < 15 d / D ≥ 15
Mean diameter (d) ± 1.5% (min ± 0.15) ± 2% (min ± 0.2) ± 3% (min ± 0.3)
Free length (L) ± 2% (min ± 0.5) ± 3% (min ± 0.7) ± 4% (min ± 1.0)
Spring factor (k) ± 6% ± 8% ± 10%
Load (P) load tolerance (kg) / spring factor (kg / mm) ≥ tolerance of free length (mm) (minimum value ± 8%) allowable
tolerance of torsion spring
Item 4 ≤ D / d < 8 ≤ D / d < 15 d / D ≥ 15
Mean diameter (d) ± 1.5% (min ± 0.15) ± 2% (min ± 0.2) ± 3% (min ± 0.3)
Torsion angle (θ) ± 0.9na ° (minimum ± 3 °) ± 1.1na ° (minimum ± 4 °) ± 1.5na ° (minimum ± 6 °)
Torque (m) torque tolerance (kg ~ mm) / spring constant number (kg ~ mm / deg) ≥ the above recorded torsion angle tolerance (DEG) (minimum value ± 5%)