For internal tooth lock washers, DIN 6798 J 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 6798 J — Scope
DIN 6798 J specifies the dimensional requirements for internal tooth lock washers. 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 internal tooth lock washers 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 6798 J
| Size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness s (mm) | Type | Reference standard |
|---|---|---|---|---|---|
| M2 | 2.2 | 4.2 | 0.2 | Internal teeth | DIN 6798 J |
| M2.5 | 2.7 | 5.1 | 0.2 | Internal teeth | DIN 6798 J |
| M3 | 3.2 | 6 | 0.2 | Internal teeth | DIN 6798 J |
| M3.5 | 3.7 | 7 | 0.25 | Internal teeth | DIN 6798 J |
| M4 | 4.3 | 8 | 0.25 | Internal teeth | DIN 6798 J |
| M5 | 5.3 | 9.8 | 0.3 | Internal teeth | DIN 6798 J |
| M6 | 6.4 | 11.8 | 0.4 | Internal teeth | DIN 6798 J |
| M8 | 8.4 | 15.3 | 0.4 | Internal teeth | DIN 6798 J |
| M10 | 10.5 | 19 | 0.5 | Internal teeth | DIN 6798 J |
| M12 | 13 | 23 | 0.5 | Internal teeth | DIN 6798 J |
| M14 | 15 | 26.2 | 0.6 | Internal teeth | DIN 6798 J |
| M16 | 17 | 30.2 | 0.6 | Internal teeth | DIN 6798 J |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Internal Tooth Lock Washers page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify DIN 6798 J
DIN 6798 J is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
