BS EN 13906-3:2014

Foreword
1 Scope
2 Normative references
3 Terms and definitions, symbols, units and
   abbreviated terms
4 Theoretical torsion spring diagram
5 Design Principles
6 Types of loading
7 Stress correction factor q
8 Material property values for the calculations of
   springs
9 Design formulate
10 Permissible bending stress
Bibliography

Describes the calculation and design of cold and hot coiled cylindrical helical torsion springs with a linear characteristic, made from round wire and bar of constant diameter with values according to Table 1.

This European Standard specifies the calculation and design of cold and hot coiled cylindrical helical torsion springs with a linear characteristic, made from round wire and bar of constant diameter with values according to Table 1. Table 1 Characteristic Cold coiled torsion spring Hot coiled torsion springa Wire or bar diameter d ≤ 20 mm d ≥ 10 mm Number of active coils n ≥ 2 n ≥ 2 Spring index 4 ≤ w ≤ 20 4 ≤ w ≤ 12 a The user of this European Standard shall pay attention to the design of hot coiled springs, because there can be differences between the design and a real test.