DIN 2093 Disc Spring (Spring Washer) Classification

Classification according to DIN 2093

Mubea disc springs have been designed and manufactured according to DIN 2093 (Disc springs, Calculation, Dimensions, Quality requirements). Standard DIN 2093 disc springs are classified into 3 groups:

  • Group 1: Disc thickness, t, less than 1.25 mm (Manufactured without contact surfaces)
  • Group 2: Disc thickness, t, from 1.25 mm to 6 mm (Manufactured without contact surfaces)
  • Group 3: Disc thickness, t, over 6 mm up to 14 mm (Manufactured with contact surfaces)
din-2093-group1-2

Group 1 and 2 springs without contact surfaces

din-2093-group3

Group 3 springs with contact surfaces

DIN 2093 Spring Requirements

Group Production Method Surface Finish**)
Upper and lower surfaces µ Inner and outer edges µ
1 stamped, cold-formed, edges rounded R2 < 3.2 R2 < 12.5
2*) stamped, cold-formed, De and Di turned, edges rounded R2 < 6.3 R2 < 6.3
fine-blanked, cold-formed, edges rounded R2 < 6.3 R2 < 3.2
3 cold- or hot-formed, turned on all sides, edges rounded R2 < 12.5 R2 < 12.5
*) Unless otherwise specified, the manufacturing process is left to the discretion of the manufacturer (see Section 5 in DIN 2093).
**) The specified values do not apply to shot-peened disc springs.

Other production methods, such as laser-beam cutting or water-jet cutting etc., may be used for the production of special disc springs. In addition to disc springs with a rectangular cross-section and rounded edges, there are the following types:

  • Disc springs with a trapezoidal cross-section
  • Disc springs with slots