| Formula Symbol Key | ||
| Variable | Definition | Units |
| t | Material Thickness | Inches |
| w | Material Width | Inches |
| L | Active Length | Inches |
| E | Elastic Modulus | Lbs/Inch2 (psi) |
| F | Flexivity | Inch/Inch/ºF |
| A | Angular Rotation (Coils) | Degrees |
| B | Linear Deflection | Inches |
| P | Force | Ounces |
| r | Radius At Point of Load (Coils) | Inches |
| D | Outside Diameter (Disc) | Inches |
| d | Inside Diameter (Disc) | Inches |
| (T2 - T1) | Temperature Change | ºF |