DIN6928 Hexagon Washer Head Tapping Screws
DIN 6928 Hexagon Washer Head Tapping Screws are designed for fastening applications where the screw must create or engage its own thread in the receiving material while providing a broad bearing surface under the head. The integrated washer head distributes the tightening load over a larger area than a conventional hexagon head tapping screw, helping reduce localized pressure on sheet metal and other relatively thin components. The hexagonal head also allows efficient installation with a standard wrench or socket.
The combination of a self-tapping thread and washer head makes DIN 6928 screws particularly practical for assemblies where separate nuts or loose washers are inconvenient to use. They can be used to join sheet metal, profiles, panels, brackets, and other components in mechanical and equipment construction, with the screw design selected according to the base material, required thread engagement, joint thickness, and installation method.
Specification:
DIN 6928 Hexagon Washer Head Tapping Screws are specified by their tapping thread, integrated washer head, hexagon drive, and overall screw geometry. The tapping thread is designed to engage directly with a prepared hole or suitable substrate, while the washer head provides a wider bearing surface beneath the hexagonal head. This configuration is particularly useful for fastening sheet-metal components and assemblies where a separate washer or nut is not required.
The standard size range covers tapping screw diameters from ST2.9 to ST8, with screw length selected according to the thickness of the components and the required thread engagement. Depending on the application, the screws can be supplied in carbon steel or stainless steel, with surface treatments such as zinc plating, zinc flake coating, black oxide, or other finishes. Thread form, point configuration, head dimensions, mechanical properties, and coating requirements can be specified according to the base material and installation conditions.
| Item | Specification |
|---|---|
| Standard | DIN6928 |
| Product Type | Hexagon Washer Head Tapping Screw |
| Head Type | Hexagon Washer Head |
| Drive | Hexagon |
| Thread Type | Tapping Thread |
| Thread Diameter | ST2.9-ST8 |
| Material | Carbon Steel,Stainless Steel |
| Surface Treatment | Bright Finish/Passivation/Zinc Plated/Black Oxidation/Dacromet |
| Installation | Wrench or Socket |
Dimension Chart of DIN6928 Hexagon Washer Head Tapping Screws:
The DIN 6928 dimension chart provides the dimensional references needed to select the correct tapping screw for the thickness and fastening requirements of the assembly. The size range from ST2.9 to ST8 covers different fastening requirements, while the screw length determines the available thread engagement in the receiving material. The hexagon head dimensions and integrated washer diameter are also important when checking tool access and the bearing area beneath the screw head.
The chart includes the main dimensions for each DIN 6928 size, such as nominal diameter (d), screw length (l), width across flats (s), head height (k), and washer head diameter (dc). When selecting the screw, the diameter should correspond to the required thread-forming capacity of the substrate, while the length should provide sufficient engagement without excessive penetration beyond the joined components. The washer head diameter should also provide adequate bearing coverage around the fastening point.
| Mon | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | ST8 |
| P | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | 2.1 |
| a max | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | 2.1 |
| h min | 0.4 | 0.6 | 0.8 | 0.9 | 1 | 1 | 1.2 |
| dc max | 6.3 | 8.3 | 8.8 | 10.5 | 11 | 13.5 | 18 |
| dc min | 5.8 | 7.6 | 8.1 | 9.8 | 10 | 12.2 | 16.7 |
| e min | 4.28 | 5.96 | 7.59 | 8.71 | 8.71 | 10.95 | 14.26 |
| k max | 2.8 | 3.4 | 4.1 | 4.3 | 5.4 | 5.9 | 7 |
| k min | 2.5 | 3 | 3.6 | 3.8 | 4.8 | 5.3 | 6.4 |
| r min | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 | 0.4 |
| s max | 4 | 5.5 | 7 | 8 | 8 | 10 | 13 |
| s min | 3.82 | 5.32 | 6.78 | 7.78 | 7.78 | 9.78 | 12.73 |
| d max | 2.9 | 3.53 | 4.22 | 4.8 | 5.46 | 6.25 | 8 |
| d min | 2.76 | 3.35 | 4.04 | 4.62 | 5.28 | 6.03 | 7.78 |
| d1 max | 2.18 | 2.64 | 3.1 | 3.58 | 4.17 | 4.88 | 6.2 |
| d1 min | 2.08 | 2.51 | 2.95 | 3.43 | 3.99 | 4.7 | 5.99 |
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Application of DIN6928 Hexagon Washer Head Tapping Screws:
DIN 6928 Hexagon Washer Head Tapping Screws are used for joining components where a threaded nut is not practical and the screw can form or engage a thread directly in the supporting material. Smaller sizes such as ST2.9–ST4.2 are suitable for thin sheet-metal parts, electrical junction boxes, instrument housings, ventilation grilles, cable trays, and appliance panels. Medium sizes from ST4.8–ST6.3 can be used for air-conditioning units, electrical cabinets, HVAC duct components, metal enclosures, shelving systems, and equipment brackets. Larger ST6.3–ST8 screws are suitable for heavier sheet-metal assemblies, steel profiles, machine covers, mounting rails, agricultural equipment panels, and fabricated equipment structures where a larger bearing area is beneficial.
Carbon steel versions are commonly selected for indoor machinery, electrical cabinets, metal furniture, ventilation equipment, and general sheet-metal fabrication, with zinc-plated or other protective coatings used according to the service environment. Stainless steel versions are better suited to applications exposed to moisture or corrosive conditions, such as commercial kitchen equipment, food-processing enclosures, outdoor electrical cabinets, refrigeration units, and marine-related sheet-metal assemblies. The integrated washer head is particularly useful when fastening relatively thin or coated sheet materials because its larger bearing surface helps distribute the clamping load around the screw entry point.