For tab washers (din 93 / din 463), DIN 93 is the governing document for the dimensions listed below. Mechanical and performance requirements for this part family are set by its own standards, not by the bolt and screw property-class documents.
DIN 93 — Scope
DIN 93 specifies the dimensional requirements for tab washers (din 93 / din 463).
Material, surface condition and any performance rating are set by separate documents specific to this part family — ISO 898-1 and ISO 898-2, which govern bolt and nut property classes, do not apply here.
Tolerance & Product Grades
Tolerances for tab washers (din 93 / din 463) are given as limits on the individual dimensions in the table rather than as a fastener product grade.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by DIN 93
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Tab length (mm) | Form | Material | Reference standard |
|---|---|---|---|---|---|---|---|
| M6 | 6.4 | 14.0 | 0.8 | 8 | Single tab (DIN 93) | Mild steel | DIN 93 |
| M8 | 8.4 | 18.0 | 1.0 | 10 | Single tab (DIN 93) | Mild steel | DIN 93 |
| M10 | 10.5 | 22.0 | 1.0 | 12 | Single tab (DIN 93) | Mild steel | DIN 93 |
| M12 | 13.0 | 26.0 | 1.25 | 14 | Single tab (DIN 93) | Mild steel | DIN 93 |
| M16 | 17.0 | 32.0 | 1.5 | 16 | Single tab (DIN 93) | Mild steel | DIN 93 |
| M20 | 21.0 | 40.0 | 2.0 | 20 | Single tab (DIN 93) | Mild steel | DIN 93 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Tab Washers (DIN 93 / DIN 463) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify DIN 93
DIN 93 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
