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1500H Corrosion-Resistant Coated Hexagon Self-Drilling Tapping Screw With EPDM Washer
●Material: Carbon Steel
●Surface Treatment: Galvanized, Black Oxide, Hot Dip Galvanizing, Dacromet，Ruspert
●Size: 6#,7#,8#,10#,12#,14# / ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, ST6.3
●Length: 13-125MM
●Standard: DIN,ANSI,BSW,JIS,GB
Description
marker
As a high-performance fastener integrating efficiency, corrosion resistance and sealing, our Dacromet-Coated Hexagon Composite Washer Self-Drilling Tapping Screws are engineered to address the core pain points of fastening in harsh environments—such as poor corrosion resistance, complicated installation and easy loosening. With advanced Dacromet coating technology and integrated composite washer design, the product delivers reliable performance in diverse demanding scenarios.
- Core Product Configuration
The product combines three key components to ensure comprehensive performance, each with strict material and process control:
- Hexagon Head: Made of high-strength carbon steel (1022A) or stainless steel (304/316) based on application requirements. The hexagonal structure enables easy tightening with standard wrenches or sockets, providing excellent torque transmission and avoiding slipping during installation.
- Dacromet Coating: Adopts industrial-grade Dacromet (Zn-Al flake) coating process, with a coating thickness of 8-12μm. The coating forms a dense Zn-Al alloy protective layer, far exceeding the corrosion resistance of traditional galvanizing.
- Integrated Composite Washer: The washer is compounded by EPDM rubber (or silicone rubber for high-temperature scenarios) and metal backing plate. It is pre-assembled with the screw, eliminating the need for separate washer installation and ensuring consistent sealing performance.
- Self-Drilling Tapping Shank: Features a precision-machined drill point (with 135° tip angle) and high-pitch thread. It can directly drill, tap and fasten in one step without pre-drilling, greatly improving construction efficiency.
Key Technological Advantages
Superior Corrosion Resistance from Dacromet Coating
Dacromet coating is the core competitive advantage of this product, with performance that outperforms conventional anti-corrosion treatments:
- Salt Spray Test Resistance: ≥1000 hours of neutral salt spray test without red rust (far exceeding 240 hours of hot-dip galvanizing and 72 hours of electro-galvanizing).
- Environmental Adaptability: Resists corrosion from moisture, salt fog, industrial fumes and weak acids/alkalis, suitable for coastal areas, industrial workshops and outdoor harsh environments.
- High-Temperature Stability: Maintains stable corrosion resistance at -50℃ to 300℃, without peeling or cracking due to temperature changes.
- Eco-Friendliness: Contains no heavy metals such as chromium, complying with RoHS and REACH environmental standards.
Efficient Installation & Reliable Sealing
- One-Step Installation: The self-drilling tip can penetrate materials such as 0.8-6mm thin steel plates, color steel tiles and aluminum profiles directly. The tapping thread forms a tight fit with the base material, reducing installation time by 40% compared to traditional screws.
- Integrated Sealing: The composite washer is compressed during tightening to fill gaps between the screw head and the base material, effectively preventing water, dust and air infiltration. The water tightness test shows no leakage under 0.3MPa water pressure.
- Anti-Loosening Performance: The elastic recovery of the rubber washer absorbs vibration and compensates for thermal expansion and contraction of the base material, avoiding loosening caused by equipment operation or environmental vibration.
Product Size of EPDM Washer Zinc Plated Din 7504 Hex Head Self Drilling Screws
| Nominal Diameter d |
ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | |
| P | Thread Pitch | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a | Max | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| C | Min | 0.4 | 0.6 | 0.8 | 0.9 | 1 | 1 |
| dc | Max | 6.30 | 8.3 | 8.8 | 10.5 | 11 | 13.5 |
| Min | 5.80 | 7.6 | 8.1 | 9.8 | 10 | 12.2 | |
| e | Min | 4.28 | 5.96 | 7.59 | 8.71 | 8.71 | 10.95 |
| k | Max | 2.80 | 3.4 | 4.1 | 4.3 | 5.4 | 5.9 |
| Min | 2.50 | 3 | 3.6 | 3.8 | 4.8 | 5.3 | |
| kw | Min | 1.3 | 1.5 | 1.8 | 2.2 | 2.7 | 3.1 |
| r1 | Min | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 |
| r2 | Max | 0.2 | 0.25 | 0.3 | 0.3 | 0.4 | 0.5 |
| s | Max | 4.00 | 5.5 | 7 | 8 | 8 | 10 |
| Min | 3.82 | 5.32 | 6.78 | 7.78 | 7.78 | 9.78 | |
| Drilling Depth / Sheet Metal Thickness | ≥ | 0.7 | 0.7 | 1.75 | 1.75 | 1.75 | 2 |
| 1.9 | 2.25 | 3 | 4.4 | 5.25 | 6 | ||
Typical Application Scenarios
With its excellent comprehensive performance, the product is widely used in multiple industries requiring high corrosion resistance and sealing:
- Construction Industry: Fastening of color steel roofs, metal curtain walls, steel structure workshops and prefabricated houses—especially suitable for coastal buildings and industrial plants with high corrosion requirements.
- HVAC & Pipeline: Installation of air conditioning outdoor units, ventilation ducts and water supply pipelines, preventing water leakage and corrosion.
- Automotive & Equipment: Fastening of automotive body parts, agricultural machinery and outdoor electrical equipment, resisting vibration and harsh environment corrosion.
- Renewable Energy: Installation of solar panel brackets and wind turbine auxiliary components, adapting to long-term outdoor exposure.
Quality Assurance & Customization
All products pass strict quality inspections, including coating thickness test, salt spray test, torque test and sealing test, complying with ISO 898-1 and DIN 7504 standards. We also provide customization services for nominal diameter, length, washer material and coating thickness according to customer-specific requirements.
For more technical details or quotation inquiries, please contact our sales team.
Company Information
Hebei Fujinrui Metal Products Co., Ltd. is an enterprise integrating fastener product production and metal surface treatment. It has multiple machining workshops and surface treatment workshops, with a workforce of more than 300 pcs employees, boasting a mature production scale and strong technical strength.
The company's can produce national standard self-drilling screws, national standard external hexagon bolts, socket head cap screws, nuts, flange bolts and nuts, national standard flat washers and spring washers, etc.and there are always bolts and self-drilling screws in stock, In addition, it undertakes external metal surface processing, adopting processes such as Dacromet, Geomet, Luxiubao, Magni, Ruspert, etc. The products processed can pass the neutral salt spray test for up to 2000 hours at the maximum, featuring excellent quality and enjoying high trust from customers.
We adhere to the corporate culture of "Quality First, Customer Supreme", always insisting on technological innovation and process optimization, and are committed to providing customers with high-quality fastener products. The company's products are sold both at home and abroad and have won widespread market recognition.
We meet with the key personnel who work for the workshop before production after the order is verified.
Check the craftsmanship and technological elements to ensure that everything is in order.
1. Upon arrival, check all the materials to make sure they meet the needs of the customers.
2. Examine the intermediate products.
3. Internet quality assurance
4. Control of final items' quality
5. Final inspection when the goods are being packed. If there are no other issues at this time,The inspection report and shipping release will be issued by our QC.
6. We take careful care of your items when they are being shipped. Boxes can endure common impacts during handling and shipping.
FAQ
Q: when can I get quotation sheet ?
A: Our sales team will make quotation within 24 hours,if you are hurry ,you can call us or contact us online,we will make quotation for you asap
Q: How can I get sample to check your quality?
A: We can offer sample for free,but usually freight is at customers side ,but the cost can be refund from bulk order payment
Q: Can we print our own logo ?
A: Yes, we have professional design team which service for you ,we can add your logo on your package
Q: How long is your delivery time?
A: Generally it is about 30 days accordng to your order qty of items
Q: You are a manufacturing company or trading company?
A: We are more than 20 years professional fasteners manufacturing and have exporting experience for more than 12 years.
Q: What is your payment term?
A: Generally, 30% T/T in advance ,balance before shippment
contact us
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