Jiaxing City Qunbang Hardware Co., Ltd
| Supply Ability | 800TON/MONTH |
| Payment Terms | T/T |
| Delivery Time | 15DAY |
| Packaging Details | 25KG/BAG |
| Place of Origin | CHINA |
| Brand Name | QBH |
| Certification | ISO9001 |
| Model Number | DIN7504K |
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Product Specification
| Supply Ability | 800TON/MONTH | Payment Terms | T/T |
| Delivery Time | 15DAY | Packaging Details | 25KG/BAG |
| Place of Origin | CHINA | Brand Name | QBH |
| Certification | ISO9001 | Model Number | DIN7504K |
| High Light | DIN7504K self-drilling screws ，self-drilling screws with EPDM washer ，steel self-drilling screws | ||
DIN 7504-K Hexagon Washer Head Self‑Drilling Screws with EPDM Bonded Washer
This product is a hexagon washer head self‑drilling screw manufactured to DIN 7504‑K, featuring an integrally bonded EPDM (ethylene‑propylene‑diene monomer) sealing washer. The screw combines a self‑drilling drill point that eliminates pre‑drilling with a self‑tapping thread, enabling single‑operation fastening into steel, wood, aluminium, and composite materials. Available in carbon steel (C1022A with case hardening) and stainless steel (A2‑304, A4‑316), with thread sizes from ST3.5 to ST8.0 and lengths from 16 mm to 150 mm. Primarily used in metal roofing, cladding, façades, and exterior construction where a weather‑tight seal is required.
What are the dimensional specifications and available sizes for DIN 7504‑K screws with EPDM washer?
Thread diameters range from ST3.5 to ST8.0, with common sizes including M4.8 (#10), M5.5 (#12), and M6.3 (#14). Lengths available from 19 mm to 150 mm. The EPDM bonded washer diameter is typically Ø16 mm for M4.8 and M5.5 sizes, with larger Ø18, Ø19, and Ø25 mm options available. The hexagon head features an integral flange washer, with across‑flats dimensions of 8 mm for M5.5 and 10 mm for M6.3 sizes. Threads are fully threaded along the shank.
What material grades, mechanical properties, and surface finishes are available?
Carbon steel versions are manufactured from SAE J403 1022 special steel for thermal treatment. Case hardening requirements: surface hardness > 500 HV, core hardness 240‑450 HV, with case depth varying by thread size (ST3.9‑5.5: 0.10‑0.23 mm; ST6.3: 0.15‑0.28 mm). Property grades include 4.8, 8.8, and 12.9. Stainless steel variants available in A2‑70 (304) and A4‑80 (316), with A4‑316 offering molybdenum‑enhanced resistance to saltwater and harsh chemicals. Surface finishes include zinc plating (clear, yellow, black), Dacromet, Ruspert, phosphate, and black oxide. Zinc plating thickness ≥ 3 µm per ISO 4042. Colour‑matched painted heads available per RAL chart.
How does the EPDM bonded washer function, and what corrosion resistance does the assembly provide?
The EPDM (ethylene‑propylene‑diene monomer) washer is permanently bonded to the screw, creating a weather‑tight, waterproof seal that prevents water infiltration through the fastener hole. EPDM provides excellent resistance to ozone, UV radiation, weathering, and temperature extremes (service range typically ‑40°C to +120°C). The bonded washer design ensures the seal remains captive during installation, eliminating the need for separate sealing components. For carbon steel with zinc plating, corrosion resistance is suitable for exterior environments; for marine and coastal applications, A4‑316 stainless steel is recommended. The self‑drilling point offers drilling capacity up to 3.0 mm in steel for standard points, with heavier section versions capable of drilling up to 5.5 mm. The assembly complies with BS EN 10666 (DIN 7504).
Certifications & Package
FAQ
Company Details
Business Type:
Manufacturer,Trading Company,Seller
Year Established:
2014
Total Annual:
3000-4500
Employee Number:
100~150
Ecer Certification：
Verified Supplier
Jiaxing City Qunbang Hardware Co., Ltd. (brand: QBH) is a fastener enterprise integrating production, design, sales, and after-sales service. The company is located in the Hangzhou-Jiaxing-Huzhou Plain, close to Shanghai, Ningbo, and Zhapu ports. Thanks to its superior geographical position and conv... Jiaxing City Qunbang Hardware Co., Ltd. (brand: QBH) is a fastener enterprise integrating production, design, sales, and after-sales service. The company is located in the Hangzhou-Jiaxing-Huzhou Plain, close to Shanghai, Ningbo, and Zhapu ports. Thanks to its superior geographical position and conv...
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