DIN 436
DIN 436 covers square washers, especially for timber construction. The current edition is 2024-10; this table describes a commercial selection and does not replace the complete standard. DIN 436 is not ASTM F436.
DIN 436
Square washer with round hole · 100 HV
A flat square washer providing a broad bearing surface, particularly for timber joints. Its round hole and parallel faces distinguish it from tapered washers for steel sections: select bore, side length and thickness for the assembly.
UNI 6596
- Dimensional range
- M10–M27
- Series
- Square · flat · round hole
- Configuration
- 100 HV
- References
- UNI 6596
Technical drawing and dimensional range
Commercial selection M10, M12, M16, M20, M24 and M27 in 100 HV steel. Intermediate sizes and other geometries can be assessed on request. Nominal dimensions: also specify tolerances, material and finish for supply.
Dimensions in mm. Identification drawing, not a manufacturing drawing.
| M | d1 | Side a | s | kg / 1,000 pcs |
|---|---|---|---|---|
| 10 | 11 | 30 | 3 | 20 |
| 12 | 13.5 | 40 | 4 | 45.7 |
| 16 | 17.5 | 50 | 5 | 88.7 |
| 20 | 22 | 60 | 5 | 126 |
| 24 | 26 | 80 | 6 | 275 |
| 27 | 30 | 90 | 6 | 348 |
Indicative supplier-catalogue weight for each size in plain steel. It is not a normative or certified batch weight; do not transfer it to stainless versions or different dimensions.
The steel version described has hardness class 100 HV. Check bearing pressure on the substrate, washer bending and edge distances; a larger bearing surface alone does not determine joint capacity.
Materials and property classes
| Material | Class / hardness | Configurable range | Supply |
|---|---|---|---|
| Steel to mechanical specification | 100 HV | M10–M27 | On request |
Other materials and specifications on request
A2 / A4 stainless to specification →Custom side, bore and thickness →Zinc plating and specified coatings →
Other dimensions, materials and finishes can be assessed on request. For substantial quantities we can review custom washers with specified sides, thicknesses and holes, agreeing requirements and minimum batch size.
Enquire about another material or ASTM specification
Finishes and treatments
| Finish | Material | Class / hardness | M |
|---|---|---|---|
| Plain / as manufactured | Steel to mechanical specification | 100 HV | M10–M27 |
The tabulated selection is plain steel. Enquire about zinc plating and other coatings, specifying service environment, coating thickness and supply requirements.
ISO, DIN and UNI: key differences
UNI 6596
Related commercial reference. Compare bore, side length, thickness and supply conditions; listing the references together does not imply exact equivalence.
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
Related round washers are alternatives to compare for envelope, bearing surface and geometry; they are not automatically interchangeable replacements.
For timber construction, size the connection to the project requirements. The washer does not replace verification of the substrate or assembly-specific documentation.
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.