DIN 2089 is the governing dimensional standard for torsion springs. This page sets out the scope of the standard, reproduces the full size table it specifies, and lists the DIN/ISO/ASME cross-references commonly cited in datasheets and drawings.
DIN 2089 — Scope
DIN 2089 specifies the dimensions and tolerances of torsion springs. Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).
Tolerance & Product Grades
DIN 2089, alongside the related DIN 2089 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.
Dimensions Specified by DIN 2089
| Wire dia d (mm) | Inner diameter Di (mm) | Outer diameter De (mm) | Length Lo (mm) | Coils n | Torque range | Material | Reference standard |
|---|---|---|---|---|---|---|---|
| 0.5 | 4.0 | 5.0 | 10 | 6 | 5~15Nmm | Spring steel | DIN 2089 |
| 0.6 | 5.0 | 6.2 | 12 | 6 | 8~25Nmm | Spring steel | DIN 2089 |
| 0.8 | 6.0 | 7.6 | 15 | 6 | 18~55Nmm | Spring steel | DIN 2089 |
| 1.0 | 8.0 | 10.0 | 18 | 6 | 35~100Nmm | Spring steel | DIN 2089 |
| 1.2 | 9.0 | 11.4 | 20 | 6 | 65~190Nmm | Spring steel | DIN 2089 |
| 1.5 | 12.0 | 15.0 | 25 | 6 | 150~420Nmm | Spring steel | DIN 2089 |
| 2.0 | 15.0 | 19.0 | 30 | 6 | 380~1100Nmm | Spring steel | DIN 2089 |
| 2.5 | 20.0 | 25.0 | 35 | 6 | 900~2500Nmm | Spring steel | DIN 2089 |
| 3.0 | 25.0 | 31.0 | 40 | 6 | 1800~5000Nmm | Spring steel | DIN 2089 |
| 4.0 | 32.0 | 40.0 | 50 | 6 | 5500~15000Nmm | Spring steel | DIN 2089 |
Companion Standards
DIN 2089 controls only the geometry of torsion springs. The mechanical strength is set by ISO 898-1 (bolts and screws) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards (e.g. ISO 4042 for electroplating). For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).
When to Specify DIN 2089
DIN 2089 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.