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A guide to using heavy duty springs from Lee Spring

Managing Director of Lee Spring UK, Chris Petts, explains when to use heavy duty Hefty Die Springs and what the benefits are.

A Die Spring is a heavy duty metal compression spring that is manufactured using round wire and designed to be used as a Die Spring or heavy duty coil spring in heavy stress, heavy load applications.

The ends of a Die Spring are closed and ground, providing appropriate squareness and adequate large bearing surface. This enables the heavy duty compression springs to stand on either end and makes them suitable for use in applications that require heavy duty coil springs.

Tests conducted by the Institute of Spring Technology (IST -the UK based unique centre of excellence for spring research) have demonstrated the same life expectancy for HEFTY Die Springs from Lee Spring as for traditional rectangular wire Die Springs.

Lee Spring offers five different HEFTY Die Spring configurations, according to load. HEFTY Die Springs are suitable for applications from medium duty up to extra heavy duty die springs, depending requirements.
These heavy duty springs can be found in brakes, clutches, aircraft mechanisms and farm machinery.

Features and Benefits of Heavy Duty Hefty Die Springs

  • Life expectancy of the spring is extended because HEFTY Die Springs are shot-peened
  • Length loss is prevented for Die Springs in operation thanks to presetting (Presetting means to initially make the spring a little bit too long and then compress it to the correct height)
  • Heavy Duty Die Springs can be easily identified because they are powder coated and colour coded

When Specifying and Using Die Springs

  • Establish whether the springs will be required for short run, rapid cycle or extra stress
  • Use the maximum number of springs possible with the least amount of deflection
  • Operate the spring within the ideal operating range – this is even more important when a spring is used more rapidly
  • Die springs should not be reworked by grinding the inside or outside diameter, or by cutting off coils. These practices could result in premature spring failure and possible die damage
  • All springs in the die should be replaced at the same time to ensure even load distribution
  • Hole and rod sizes must be properly matched with the spring as faulty spring guidance will cause buckling, resulting in possible spring failure
  • Regular preventative maintenance will help to prevent downtime


The Die Spring features in the current Lee Spring catalogue, which is available to order through the company website. For further information please contact us.



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