DIN 557
DIN 557 identifies the chamfered commercial geometry. Dimensions and combinations support product selection; specify supply conformity, property class and tolerances in the order.
DIN 557
Chamfered square nut
Four flat sides allow tool engagement or location in a pocket that prevents rotation. Select the chamfered square nut by thread, height and the space available in its housing.
UNI 5597
- Dimensional range
- M5–M16
- Thread
- Metric · coarse pitch
- Configuration
- Square · chamfered
- References
- UNI 5597
Technical drawing
- d
- nominal internal thread
- P
- pitch
- s
- width across parallel flats
- m
- height
Variants and dimensional data
Verified commercial sizes M5, M6, M8, M10, M12 and M16. Other sizes, heights and threads on request. Width s is measured between parallel faces, not across the diagonal.
Dimensions in mm. Identification drawing, not a manufacturing drawing.
| M | Pitch P | s | m |
|---|---|---|---|
| 5 | 0.8 | 8 | 4 |
| 6 | 1 | 10 | 5 |
| 8 | 1.25 | 13 | 6.5 |
| 10 | 1.5 | 17 | 8 |
| 12 | 1.75 | 19 | 10 |
| 16 | 2 | 24 | 13 |
Dimensions s and m are commercial selection references. Allow clearance and tolerances in the housing; the square shape does not make the nut self-locking. The listed class identifies the requested commercial version, not every supply in the DIN 557 family.
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 557 | Stainless A2 | To be specified | To be specified |
| DIN 557 | Stainless A4 | 80 | To be specified |
| DIN 557 | Steel | 6 | GEOMET 321A; Plain; Zinc plated |
“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 5597
Related reference in commercial catalogues. No exact normative equivalence is claimed; compare geometry and the supply specification.
Configure your enquiry
Selections follow the technical combinations in this data sheet. Quantities, delivery terms and documents will be agreed in the quotation.
Other materials, property classes and finishes available on request. Each configuration is assessed against the enquiry specification.
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 4017
Fully threaded hexagon head screw
Technical data sheet →
ISO 7089
Plain washer, normal series
Technical data sheet →Match nominal diameter, pitch, strength, material, finish and joint conditions.
Joint strength depends on nut class, mating bolt and effective thread engagement. Do not automatically transfer class 8 hexagon-nut pairing rules to this commercial class 6 version.