- Active Coils (N)
- Angular Relationship of Ends Degrees
- Close Wound
- Closed and Ground Ends
- Closed End
- Closed Length mm
- Coils per mm
- Dead Coils
- Deflection (F) mm
- Elastic Limit
- Free Angle (Θ) Degrees
- Free Length (F/L) mm
- Rate (R) N/mm
- Hot Setting
- Helical Springs
- Initial Tension N
- Mean Diameter (D) mm
- Modulus of Rigidity (G)
- Young’s Modulus (E)
- Moment (M) N/m
- Natural Frequency (n) Hz
Coils that are free to deflect under load
Extension and torsion springs, relates to relative end positions of loops and legs respectively.
Process of heating the material so that it becomes ductile and soft.
Heating of electroplated springs to relieve hydrogen embrittlement
Compression spring, lateral displacement due to loading. This effect is a function of slenderness ratio L/D
Generally applies to tension & torsion springs where adjacent coils touch.
End coils of a compression spring are closed and ground flat. See Closed End.
End coils of compression spring are closed by reducing the coil pitch angle until they are square with the spring axis and touch the adjacent coil.
Compression springs, see Solid Height
Number of coils per length, See Pitch
Compression spring, Inactive coils
Distance moved due to an external load
The stress point at which the wire material, if subjected to higher stress, will no longer return to its original shape. Applied to a spring, the maximum stress at a given stress ratio at which material will operate in a given environment for a stated number of cycles without failure.
Torsion spring, angle between legs when not under load.
Compression spring, overall length when not under load.
Ratio of load [N] to deflection [mm].
A process to improve spring relaxation when operating at elevated temperatures.
Wire or bar wound to form a helical coil.
The loss of mechanical energy during loading and unloading whilst operating in the elastic range. Illustrated by the area between deflection curves.
Tension springs, the magnitude of force that is required to separate closely wound coils.
Tension springs, end coil formed into hooks or loops
The average diameter of the mass of spring material
Coefficient of stiffness
Ratio of Stress/Strain
Product of the distance (m) and load (N), from the spring axis to the point of load application. The force component is at 90 degree to the distance line.
Frequency is the ratio of oscillations per unit of time. The natural frequency is the lowest inherent rate of free vibration of a spring oscillating between its own ends