For bearing lock washers (mb series), DIN 5406 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 5406 — Scope
DIN 5406 is "Locking washers and locking clips for bearing lock nuts".
Tolerance & Product Grades
DIN 5406 does not divide bearing lock washers (mb series) into product grades. Tolerances are given as limits on the individual dimensions in the table.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by DIN 5406
| Designation | Shaft thread | Bore d1 (mm) | Outer diameter d2 (mm) | Thickness s (mm) | Number of outer tabs | Mating lock nut | Reference standard |
|---|---|---|---|---|---|---|---|
| MB0 | M10x0.75 | 10 | 21 | 1.0 | 11 | KM0 | DIN 5406 |
| MB1 | M12x1 | 12 | 25 | 1.0 | 11 | KM1 | DIN 5406 |
| MB2 | M15x1 | 15 | 28 | 1.0 | 11 | KM2 | DIN 5406 |
| MB3 | M17x1 | 17 | 32 | 1.0 | 11 | KM3 | DIN 5406 |
| MB4 | M20x1 | 20 | 36 | 1.0 | 11 | KM4 | DIN 5406 |
| MB5 | M25x1.5 | 25 | 42 | 1.25 | 13 | KM5 | DIN 5406 |
| MB6 | M30x1.5 | 30 | 49 | 1.25 | 13 | KM6 | DIN 5406 |
| MB7 | M35x1.5 | 35 | 57 | 1.25 | 13 | KM7 | DIN 5406 |
| MB8 | M40x1.5 | 40 | 62 | 1.25 | 13 | KM8 | DIN 5406 |
| MB9 | M45x1.5 | 45 | 69 | 1.25 | 13 | KM9 | DIN 5406 |
| MB10 | M50x1.5 | 50 | 74 | 1.25 | 13 | KM10 | DIN 5406 |
| MB11 | M55x2 | 55 | 81 | 1.5 | 13 | KM11 | DIN 5406 |
| MB12 | M60x2 | 60 | 86 | 1.5 | 13 | KM12 | DIN 5406 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Bearing Lock Washers (MB Series) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify DIN 5406
DIN 5406 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
Custom manufacturing · Made to drawing
Need a washer to this standard in a non-standard size?
Parts built to DIN 5406 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by stamping or punching.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
