Relevant only to DIN 2093 specification

The fatigue life diagrams attempt to provide the disc spring user with a means of assessing disc spring fatigue life using the data published on this website. This data is based on actual tests and extrapolated test results of this type of carbon steel disc spring.

For disc springs of a specialised nature, and those manufactured in any of the wide range of alternative corrosion and heat resisting alloys, we recommend that you seek expert assistance from ourselves.

Click on diagrams to view larger versions.

Group 1
Thickness (t) up to 1.25mm

Group 2
Thickness (t) - 1.25mm up to and including 6mm

Group 3
Thickness (t) - Above 6mm thick

Click for larger image of graph showing DIN 2093 - Group 1: Thickness (t) up to 1.25mm Click for larger image of graph showing DIN 2093 - Group 2: Thickness (t) - 1.25mm up to and including 6mm Click for larger image of graph showing DIN 2093 - Group 3: Thickness (t) - Above 6mm thick

Example of Use of Fatigue Life Diagram

Disc Spring 15 x 5.2 x 0.4 (lo = 0.95) to DIN 2093 Specification - Cycling from 50% to 75% deflection.

  1. At 75% deflection, select the greater of tensile stress points δ II or δ III = 1002N/mm2 ( δ III).
  2. Select the tensile stress value for 50% deflection at same stress point (δ III) by extrapolation of value for 45% Deflection = 735N/mm2.
  3. Select 735N/mm 2 on pre-stress axis and read vertically to the point of intersection with 1002N/mm2 plotted horizontally from the upper-stress axis.
  4. Estimated fatigue use is in excess of two million cycles

Rules of Thumb

  1. The pre-load should be a minimum of 15% of available deflection
  2. The maximum deflection must not exceed 75% of the available deflection
  3. To improve the fatigue life, we can reduce the upper stress or increase the preload or both

Please contact us for more information by using our disc spring enquiry form.

Institute of Spring TechnologyMember of UK Spring Manufacturers AssociationBelleville QualityBritish Valve and Actuator Association