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Tension Springs

A tension spring is usually a closed coil helical spring containing energy to resist a pulling force.

The pulling force causes the coils to separate at a given rate. Included in the rate is the variable-initial tension. Initial tension is the load necessary to overcome the internal forces which holds the coils tightly together.

The amount of initial tension can be varied and should be determined prior to spring production.

Tension spring ends come in five basic types:

  • Machine Hooks
  • Crossover / Full Hooks
  • Side Hooks
  • Exrended Hooks
  • Special Hook
Tolerances for extension springs vary with each design. Variances in wire and design result in tolerances for the following areas: Free length, (usually measured from inside hook to inside hook), outside diameter, end alignment of hooks, initial tension loads, and rates.