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DIN 127 is withdrawn but remains a commercial designation.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
- d1
- bore
- d2
- maximum outside diameter
- s
- section thickness
- h
- free height. Limits for the commercial series.
Variants and dimensional data
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.
Table dimensions refer to the stated execution. DIN/UNI, polymer and special variants require verification of their own dimensions; they do not automatically inherit reference geometry, weight or performance.
Materials, classes, finishes and treatments
Executions are distinguished by reference, material, class and finish. DIN, ISO and UNI references do not imply dimensional equivalence or availability of every size in each material. Supply and batch documents require quotation confirmation.
| Execution reference | Material | Class / hardness | Documented finishes |
|---|---|---|---|
| DIN 127 | Stainless A4 | To be specified | To be specified |
| DIN 127 | Stainless A2 | To be specified | To be specified |
| DIN 127 | Steel | To be specified | Dacro 320a; GEOMET 321A; Hot-dip galvanized; Iridescent ≥8 µm; To be specified; Trivalent iridescent zinc plated; Yellow zinc plated; Yellow zinc plated Cr III 12 µm with sealer; Zinc plated; Zinc plated ≥12 µm |
| DIN 127 B | Stainless A5 · 1.4571 | To be specified | To be specified |
| DIN 127 B | Duplex · 1.4462 | To be specified | To be specified |
| DIN 127 B | Stainless HCR · 1.4529 | To be specified | To be specified |
| DIN 127 B | Stainless A1 · 1.4310 | To be specified | To be specified |
“To be specified” is a requirement not established by this selection; it does not imply class 70/80, HV hardness or an automatic finish. Steel property classes do not apply to nylon/polyamide; PA6 and PA66 are distinguished only where stated. For nuts with non-metallic inserts, the material shown is the body material.
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.
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.
Configure your enquiry
Selections follow the technical combinations in this data sheet. Quantities, delivery terms and documents will be agreed in the quotation.
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 →Variants
Related products
Complementary components: check diameter, pitch, property class, material and joint conditions.
ISO 4014
Hexagon head bolt, partially threaded
Technical data sheet →
ISO 4032
Hexagon regular nut, style 1
Technical data sheet →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.