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| Symbol | Unit | Designation |
| D | mm | Mean winding diameter |
| Dd | mm | Diameter of guide mandrel |
| De | mm | Outer winding diameter |
| Dh | mm | Diameter of guide sleeve |
| Di | mm | Iinner winding diameter |
| d | mm | Wire diameter |
| E | N/mm² | Modulus of elasticy |
| e1 | mm | Deviation from the surface line |
| e2 | mm | Deviation from parallelism |
| F | N | Spring power |
| Fc | N | Theoretical spring power as a function of block length Lc |
| Fn | N | Spring power as a function of spring length Ln (Static load) |
| Fk | N | Buckling strength |
| fe | 1/s | Natural frequency of spring |
| G | N/mm² | Shear modulus |
| k | - | Tension coefficient |
| L | mm | Spring length |
| Lc | mm | Block length |
| Lk | mm | Buckling length |
| Lo | mm | Length of unloaded spring |
| Ln | mm | Permissible spring length as a function of spring power Fn |
| M | g | Weight of the spring |
| m | mm | Mean spacing of windings |
| N | - | Number of load cycles |
| n | - | Number of effective cycles |
| nt | - | Total number of windings |
| Rm | N/mm² | Minimum tensile strength |
| Sa | mm | Sum of clear minimum spacing between windings |
| S | mm | Spring path |
| Sc | mm | Spring path as a function of block length Lc |
| Sh | mm | Stroke (Working travel) |
| Sk | mm | String path as a function of buckling strength Fk |
| Sn | mm | String path as a function of spring power Fn |
| W | Nmm | Spring work capacity |
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| v | - | Bearing coefficient |
| p | kg/dm3 | Density |
| T | N/mm² | Shear strain ignoring the influence of wire bending |
| Tc | N/mm² | Shear strain as a function of block length Lc |
| Tk | N/mm² | Corrected shear strain taking account of the influence of wire bending |
| Tn | N/mm² | Shear strain as a function of spring power Fn |
| Tc | N/mm² | Permissible shear strain |
