This technical information has been contributed by
Ace Wire Spring & Form Company, Inc.
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Spring Selection Guide: Conical Extension Springs Overview

Conical Extension Springs are best suited for heavy duty or high cycle applications. The hooks can be designed for extended life as compared to standard extension springs of similar dimension. The hooks are also free to rotate to assure alignment.

Conical Extension Springs or Conical End Reduced Extension Springs are made by coiling two or three or possibly four coils gradually smaller in diameter and then forming the hook on the smallest reduced coil. The hook may be a regular hook, a crossover hook, or a half-hook to suit the requirements. This method is the easiest way to reduce the hook stresses and retard breakage. The reason for longer life is that the bending moment is lessened, thereby reducing the stress and making the hook last longer.

Conical extension end require a method of attachment to other parts in an assembly. A wide variety of ends are available for a conical extension spring including threaded insert, swivel hooks, twist loops, side loops, cross-center and extension hooks. The most common configurations can be made during the manufacture of conical extension springs.

This technical information has been contributed by
Ace Wire Spring & Form Company, Inc.
Click on Company Name for a Detailed Profile