Zinc Plated Carbon Steel Hex Washer Head Self-Drilling Screws with EPDM Washers
Zinc Plated Carbon Steel Hex Washer Head Self-Drilling Screws with EPDM Washers conform to DIN7504K standard. These high-performance industrial fasteners feature a hexagonal washer head and specialized drill point, engineered to drill pilot holes, tap mating threads, and provide secure fastening in a single operation.
- Exceptional Hardness: Heat-treated 410 grade stainless steel provides superior penetration capability for carbon steel sheets and harder substrates
- Time-Saving Efficiency: Integrated drill point eliminates pre-drilling requirements, reducing installation time and labor costs
- Corrosion Resistance: Reliable protection against atmospheric corrosion, water, and mild chemicals in humid environments
- High Torque Strength: Hexagonal head design ensures maximum torque transmission and prevents cam-out during power tool installation
- Integrated Sealing: EPDM bonded washers provide leak-proof seals for outdoor and roofing applications
- Steel Construction & Metal Framing: Fastening metal sheets to steel purlins in industrial buildings
- Roofing & Cladding: Installation of metal roof panels and wall cladding systems requiring weather resistance
- HVAC Systems: Securing ductwork and mounting equipment components in heating and cooling systems
- Automotive & Machinery: Assembly line applications requiring high-speed fastening into metal frames
- Solar Energy Systems: Mounting solar panel brackets to aluminum or steel support rails
| 螺纹规格 | ST2.9 | ST3.5 | (ST3.9) | ST4.2 | ST4.8 | (ST5.5) | ST6.3 |
|---|---|---|---|---|---|---|---|
| P (螺距) | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a max | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| c min | 0.4 | 0.6 | 0.6 | 0.8 | 0.9 | 1 | 1 |
| dc max | 6.3 | 8.3 | 8.3 | 8.8 | 10.5 | 11 | 13.5 |
| dc min | 5.8 | 7.6 | 7.6 | 8.1 | 9.8 | 10 | 12.2 |
| e min | 4.28 | 5.96 | 5.96 | 7.59 | 8.71 | 8.71 | 10.95 |
| k max | 2.8 | 3.4 | 3.4 | 4.1 | 4.3 | 5.4 | 5.9 |
| k min | 2.5 | 3 | 3 | 3.6 | 3.8 | 4.8 | 5.3 |
| kw min | 1.3 | 1.5 | 1.5 | 1.8 | 2.2 | 2.7 | 3.1 |
| r max | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 |
| s max | 4 | 5.5 | 5.5 | 7 | 8 | 8 | 10 |
| s min | 3.82 | 5.32 | 5.32 | 6.78 | 7.78 | 7.78 | 9.78 |
| dp | 2.3 | 2.8 | 3.1 | 3.6 | 4.1 | 4.8 | 5.8 |
| Drilling range | 0.7~1.9 | 0.7~2.25 | 0.7~2.4 | 1.75~3 | 1.75~4.4 | 1.75~5.25 | 2~6 |
Bolts are packed in neutral packaging boxes with standard quantities arranged in small cartons. Customized packaging configurations available upon request.
Small cartons consolidated into larger master cartons for secure transportation. Quantity per master carton customizable based on client specifications.
Palletized units securely wrapped with waterproof film and reinforced with packaging straps. Weather-resistant protection with customer-specific shipping marks.
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