DIN 7980
DIN 7980 is withdrawn but remains a commercial designation. Its geometry differs from DIN 127 B. This washer alone does not guarantee protection against vibration-induced loosening.
DIN 7980
Spring washer for socket head screws
A split washer with square cross-section and a compact outside envelope for assemblies specifying DIN 7980 geometry. Check bore, section and free height against the screw head and housing.
- Dimensional range
- M2.5–M42
- Series
- Square section · split
- Configuration
- 430–530 HV
Technical drawing and dimensional range
20 selected metric sizes from M2.5 to M42, with gaps in the range. Limits for the commercial spring-steel series. Other sizes and finishes on request.
Dimensions in mm. Identification drawing, not a manufacturing drawing.
| M | d1 min.–max. | d2 max. | b / s min.–max. | h min.–max. | kg / 1,000 pcs |
|---|---|---|---|---|---|
| 2.5 | 2.6–2.9 | 4.7 | 0.7–0.9 | 1.6–1.9 | 0.055 |
| 3 | 3.1–3.4 | 5.6 | 0.9–1.1 | 2–2.36 | 0.105 |
| 3.5 | 3.6–3.9 | 6.1 | 0.9–1.1 | 2–2.36 | 0.115 |
| 4 | 4.1–4.4 | 7 | 1.1–1.3 | 2.4–2.83 | 0.191 |
| 5 | 5.1–5.4 | 8.8 | 1.5–1.7 | 3.2–3.78 | 0.38 |
| 6 | 6.1–6.5 | 9.9 | 1.5–1.7 | 3.2–3.78 | 0.43 |
| 8 | 8.1–8.5 | 12.7 | 1.9–2.1 | 3.8–4.52 | 0.92 |
| 10 | 10.2–10.7 | 16 | 2.35–2.65 | 5–5.9 | 1.776 |
| 12 | 12.2–12.7 | 18 | 2.35–2.65 | 5–5.9 | 2.062 |
| 14 | 14.2–14.7 | 21.1 | 2.8–3.2 | 6–7.1 | 3.4 |
| 16 | 16.2–17 | 24.4 | 3.3–3.7 | 7–8.25 | 5.745 |
| 18 | 18.2–19 | 26.4 | 3.3–3.7 | 7–8.25 | 6.3 |
| 20 | 20.2–21.2 | 30.6 | 4.3–4.7 | 9–10.6 | 11.8 |
| 22 | 22.5–23.5 | 32.9 | 4.3–4.7 | 9–10.6 | 12.74 |
| 24 | 24.5–25.5 | 35.9 | 4.8–5.2 | 10–11.8 | 16.383 |
| 27 | 27.5–28.5 | 38.9 | 4.8–5.2 | 10–11.8 | 18.193 |
| 30 | 30.5–31.7 | 44.1 | 5.8–6.2 | 12–14.2 | 32 |
| 33 | 33.5–34.7 | 47.1 | 5.8–6.2 | 12–14.2 | 35 |
| 36 | 36.5–37.7 | 52.2 | 6.75–7.25 | 14–16.5 | 52.5 |
| 42 | 42.5–43.7 | 60.2 | 7.75–8.25 | 16–18.9 | 80 |
Indicative supplier-catalogue weight for each size in spring steel. This is neither a normative mass nor a certified batch weight; do not transfer it to other materials.
DIN 7980 is withdrawn but remains a commercial designation. Its geometry differs from DIN 127 B. This washer alone does not guarantee protection against vibration-induced loosening.
Materials and property classes
| Material | Class / hardness | Configurable range | Supply |
|---|---|---|---|
| Spring steel | 430–530 HV | M2.5–M42 | On request |
Other materials and specifications on request
Other sizes, coatings and A2/A4 stainless versions on request. Stainless variants require their own dimensions and properties; they do not inherit spring-steel hardness or mass.
Enquire about another material or ASTM specification
Finishes and treatments
| Finish | Material | Class / hardness | M |
|---|---|---|---|
| Plain / as manufactured | Spring steel | 430–530 HV | M2.5–M42 |
| Electroplated zinc | Spring steel | 430–530 HV | M2.5–M42 |
Plain oiled or zinc-plated versions. For coated spring steel, define the process, any hydrogen-relief treatment and inspection requirements; these are not implied by the finish name alone.
ISO, DIN and UNI: key differences
Documentation
Download Dueemme data sheet ↓| Document | Status |
|---|---|
| Declaration of conformity | Subject to order agreement |
| Material certificate | Subject to order agreement |
| EN 10204 2.2 test report | Subject to order agreement |
| EN 10204 3.1 inspection certificate | Subject to order agreement |
| Dimensional inspection report | Subject to order agreement |
| Coating report | Subject to order agreement |
| Other documentation | Subject to order agreement |
Batch documents are not automatically included: specify your requirements in the RFQ.
Mating components
Compare envelopes and assembly requirements; the socket head screw link is not automatic approval of the joint.
Suitability depends on the joint and preload. It does not replace a verified locking system for high-strength joints; assess the locking solution for the application.
Application sectors
The size you need, including custom specifications
Other diameters, lengths, materials and finishes can be assessed on request. For dedicated production, we agree geometry, requirements and minimum quantities with the customer.
Send your specification →Configure your enquiry
Selections follow the technical combinations in this data sheet. Quantities, delivery terms and documents will be agreed in the quotation.