Specification summary of DIN 137 B as applied to wave washers (curved spring washers): the dimensions the standard fixes, the full size range supplied, and the related designations commonly cross-referenced.
DIN 137 B — Scope
DIN 137 B specifies the dimensional requirements for wave washers (curved spring 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 wave washers (curved spring 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 137 B
| Thread size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Material thickness s (mm) | Free height h (mm) | Reference standard |
|---|---|---|---|---|---|
| M3 | 3.2 | 6 | 0.3 | 0.7 | DIN 137 B |
| M4 | 4.3 | 8 | 0.3 | 0.8 | DIN 137 B |
| M5 | 5.3 | 10 | 0.4 | 1.0 | DIN 137 B |
| M6 | 6.4 | 11.8 | 0.5 | 1.2 | DIN 137 B |
| M8 | 8.4 | 15 | 0.5 | 1.4 | DIN 137 B |
| M10 | 10.5 | 18 | 0.6 | 1.7 | DIN 137 B |
| M12 | 13 | 20.5 | 0.8 | 2.1 | DIN 137 B |
| M14 | 15 | 24 | 0.8 | 2.3 | DIN 137 B |
| M16 | 17 | 26 | 1.0 | 2.6 | DIN 137 B |
| M20 | 21 | 32 | 1.2 | 3.2 | DIN 137 B |
| M24 | 25 | 38 | 1.5 | 3.8 | DIN 137 B |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Wave Washers (Curved Spring Washers) page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
Companion Standards
DIN 137 B controls only the geometry of wave washers (curved spring washers). Surface finish is governed by separate finish standards (for example ISO 4042 for electroplating), and corrosion testing by ISO 9227 (neutral salt spray). Mechanical performance is set by the standards specific to this part family, not by ISO 898-1 or ISO 898-2, which apply to bolts, screws and nuts.
