High-Strength Zinc Coated Self-Drilling Screws with EPDM Washer for Metal-to-Metal
Price:
Negontiation
MOQ:
20000
Delivery Time:
7-25DAYS
Brand:
YB
Product Description
High-Strength Zinc Coated Self-Drilling Screws with EPDM Washer
DIN 7504K self-drilling screws are high-performance industrial fasteners featuring hexagonal washer heads and specialized drill points. Manufactured from Grade 410 stainless steel, these screws drill their own pilot holes, tap mating threads, and provide secure fastening in a single operation. Grade 410 martensitic stainless steel is heat-treatable, making it significantly harder than 304 or 316 grades, specifically designed for metal-to-metal applications.
Core Features
- Exceptional Hardness: Heat-treated 410 grade stainless steel penetrates carbon steel sheets and harder substrates without tip burnout
- Time-Saving Efficiency: Integrated drill point eliminates pre-drilling and hole alignment, 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
Technical Specifications
| 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 |
| 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 |
| 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 |
| 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 |
Application Scenarios
- Steel Construction & Metal Framing: Fastening metal sheets to steel purlins or sub-structures in industrial buildings
- Roofing & Cladding: Installation of metal roof panels and wall cladding systems requiring weather resistance and structural integrity
- 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
Packaging Options
Carton Packaging
Bolts are packed in neutral packaging boxes with standard quantities arranged in small cartons. Exact unit quantities per carton are confirmed with customers to align with specific requirements. Customized packaging configurations available upon request.
Outer Carton Box Packaging
Small cartons are consolidated into larger master cartons for secure transportation and storage. Quantity per master carton can be customized based on client specifications or standard logistical requirements.
Pallet Packaging
Palletized units are securely wrapped with waterproof film and reinforced with packaging straps. Customer-specific shipping marks or labels are affixed to each pallet, ensuring clear identification and compliance with logistics requirements. This final packaging stage guarantees weather-resistant protection and stability during transportation.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
NINGBO YONGBIAO FASTENER CO.,LTD
Location
No.1 Lufeng Industrial Park, Wuxiang Town, Yinzhou District, Ningbo City, Zhejiang, China
Contact Person
Amylin