DIN 127 B
DIN 127 is withdrawn but remains a commercial designation. Form B has square ends and differs from form A with tang ends. This washer alone does not guarantee protection against vibration-induced loosening.
DIN 127 B
Split spring washer, form B
A split washer with rectangular cross-section and square ends for replacement parts and assemblies specifying this geometry. Select nominal size, free height, material and finish to suit the joint specification.
UNI 1751
- Dimensional range
- M2–M52
- Series
- Split · square ends
- Configuration
- 430–530 HV
- References
- UNI 1751
Technical drawing and dimensional range
26 commercial sizes from M2 to M52, with gaps in the range. Nominal M denotes the bolt size; h is free height and s is section thickness. Other sizes and finishes on request.
Dimensions in mm. Identification drawing, not a manufacturing drawing.
| M | d1 min.–max. | d2 max. | s min.–max. | h min.–max. | kg / 1,000 pcs |
|---|---|---|---|---|---|
| 2 | 2.1–2.4 | 4.4 | 0.4–0.6 | 1–1.2 | 0.033 |
| 2.3 | 2.3–2.6 | 4.8 | 0.5–0.7 | 1–1.2 | 0.05 |
| 2.5 | 2.6–2.9 | 5.1 | 0.5–0.7 | 1.2–1.4 | 0.053 |
| 3 | 3.1–3.4 | 6.2 | 0.7–0.9 | 1.6–1.9 | 0.11 |
| 3.5 | 3.6–3.9 | 6.7 | 0.7–0.9 | 1.6–1.9 | 0.12 |
| 4 | 4.1–4.4 | 7.6 | 0.8–1 | 1.8–2.1 | 0.18 |
| 5 | 5.1–5.4 | 9.2 | 1.1–1.3 | 2.4–2.8 | 0.36 |
| 6 | 6.1–6.5 | 11.8 | 1.5–1.7 | 3.2–3.8 | 0.83 |
| 7 | 7.1–7.5 | 12.8 | 1.5–1.7 | 3.4–4.2 | 0.93 |
| 8 | 8.1–8.5 | 14.8 | 1.9–2.1 | 4–4.7 | 1.6 |
| 10 | 10.2–10.7 | 18.1 | 2.05–2.35 | 4.4–5.2 | 2.53 |
| 12 | 12.2–12.7 | 21.1 | 2.35–2.65 | 5–5.9 | 3.82 |
| 14 | 14.2–14.7 | 24.1 | 2.85–3.15 | 6–7.1 | 6.01 |
| 16 | 16.2–17 | 27.4 | 3.3–3.7 | 7–8.3 | 8.91 |
| 18 | 18.2–19 | 29.4 | 3.3–3.7 | 7–8.3 | 9.73 |
| 20 | 20.2–21.2 | 33.6 | 3.8–4.2 | 8–9.4 | 15.2 |
| 22 | 22.5–23.5 | 35.9 | 3.8–4.2 | 8–9.4 | 16.5 |
| 24 | 24.5–25.5 | 40 | 4.8–5.2 | 10–11.8 | 26.2 |
| 27 | 27.5–28.5 | 43 | 4.8–5.2 | 10–11.8 | 28.7 |
| 30 | 30.5–31.7 | 48.2 | 5.8–6.2 | 12–14.2 | 44.3 |
| 36 | 36.5–37.7 | 58.2 | 5.8–6.2 | 12–14.2 | 67.3 |
| 39 | 39.5–40.7 | 61.2 | 5.8–6.2 | 12–14.2 | 71.7 |
| 42 | 42.5–43.7 | 68.2 | 6.75–7.25 | 14–16.5 | 111 |
| 45 | 45.5–46.7 | 71.2 | 6.75–7.25 | 14–16.5 | 117 |
| 48 | 49–50.5 | 75 | 6.75–7.25 | 14–16.5 | 123 |
| 52 | 53–54.5 | 83 | 7.75–8.25 | 16–18.9 | 182 |
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DIN 127 is withdrawn but remains a commercial designation. Form B has square ends and differs from form A with tang ends. 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–M52 | 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–M52 |
| Electroplated zinc | Spring steel | 430–530 HV | M2–M52 |
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
UNI 1751
Related commercial reference. Verify form, dimensions and material of the ordered series: commercial tables may give nominal figures that differ from the limits listed here.
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
Check bore, bearing surface, free height and joint specification. The related plain washers have different functions and geometry.
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.