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DIN7504K is the classic German standard specification for hex flange washer head self-drilling tek screws, corresponding to international standard ISO 15480. This fastener integrates three functions: drilling, self-tapping and locking in one single part. It features an integrated hexagonal head with enlarged flange washer, full continuous thread, and a sharp drill bit tip at the screw tail. Most versions come with bonded EPDM rubber sealing washer for waterproof roofing installation. Unlike ordinary self-tapping screws, it requires no pre-drilled pilot holes for metal sheet connection, greatly cutting construction time and labor cost.
Q2: What is the structural advantage of hex flange washer head design for DIN7504K?
The one-piece hex flange head brings two core advantages verified in long-term roofing projects:
Large contact flange evenly distributes clamping pressure, avoiding metal sheet deformation, denting or tearing during tightening
Matches common electric hex drivers, provides higher torsion transmission than cross recess heads, prevents tool slipping under high torque installation
The integrated flange perfectly fits EPDM sealing washers to form full waterproof locking mechanism for roof panels.
Q3: What materials do you supply for DIN7504K drilling screws, and their applicable scenarios?
We provide two mainstream material series with clear application differentiation:
Carbon steel (C1022A hardened): Cost-effective, high drilling hardness, available with zinc plating, color zinc, black phosphate, Ruspert coating. Ideal for general indoor steel frames, ordinary metal roofing, metal-to-wood connections under normal humidity. Note: High-strength carbon steel drill screws shall avoid over-thick electroplating to lower hydrogen embrittlement risk.
Stainless steel (SS410 / A2-70 SUS304 / A4-80 SUS316): SS410 offers good drilling capacity with moderate anti-rust performance for mild outdoor environments; SUS304 and SUS316 deliver superior corrosion resistance, suitable for coastal salt fog, chemical plants, long-term exposed roofing and humid outdoor installation sites.
Q4: What is the function of matched EPDM bonded washer for DIN7504K roofing screws?
The EPDM rubber-metal composite washer is a mandatory matching accessory for roof installation, forming reliable waterproof locking mechanism:
EPDM owns outstanding weather resistance, ozone resistance and aging resistance, maintaining elastic sealing for over 10 years under outdoor sun and rain
After tightening, the rubber layer closely fits gaps between screw flange and metal panel, blocks rainwater infiltration to prevent roof leakage
The built-in metal support ring avoids rubber extrusion rupture under heavy torque, keeping stable sealing performance long-term
Q5: What standard sizes (diameter & length) are available for your DIN7504K screws?
Full complete metric specifications cover mainstream construction demands:
Length range: 16mm ~ 150mm, customizable extended lengths up to 200mm for thick composite metal plates
Different drill point types (No.1~No.5 drill bits) are optional, matching different thickness of steel sheets (0.5mm ~ 12mm metal substrates). All dimensional tolerances strictly follow DIN7504K drawing requirements.
About Our Supplier
Jiaxing Xinchuang Hardware Co., Ltd.
Your Trusted Global Partner for Premier OEM Fasteners and Custom Industrial Solutions
Established in 2025, Xinchuang has evolved into a leading global manufacturer dedicated to providing high-quality fasteners and industrial components at competitive prices. With over a decade of industry experience and a state-of-the-art production facility, we specialize in delivering both standard and non-standard solutions tailored to the rigorous demands of clients worldwide.
Our Expertise and Capabilities
We are a vertically integrated manufacturer covering production, plating/finishing, and global export. Our extensive product capabilities meet both imperial and metric standards across a wide range of sizes (M1 to M100) and grades (4.8, 6.8, 8.8, 10.9, 12.9).
Our core manufacturing competencies include:
Standard Fasteners: Screws, Nuts, Washers, Anchors, Pins, Keys, Threaded Rods, and Socket Screws
Materials & Finishes: High-grade Stainless Steel, Carbon Steel, with durable Zinc, Plain, and Galvanized finishing options
Customization and R&D Strengths (Made-to-Order)
What differentiates Xinchuang is our robust OEM/ODM capability. We operate primarily on a made-to-order basis, ensuring every batch is freshly manufactured to your exact specifications. Backed by a dedicated in-house R&D department and design team, we excel at engineering specially designed fasteners for unique project needs. If the specific product you require isn't standard, our experienced sales engineers will work with you to manufacture it.
Reliable Production and Service
We understand that project success relies on component caliber and timely delivery. Through efficient production management, we ensure reliable delivery times for production orders (typically 30-40 days). We are committed to providing extensive cost savings and supply chain security for our customers through consistent quality and dependable lead times.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Year Established:
1996
Total Annual:
50000000-80000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
Founded in Jiaxing, Zhejiang Province—one of China’s central manufacturing hubs for mechanical hardware—Jiaxing Xinchuang Hardware Co., Ltd. is a professional manufacturer and exporter specializing in high-strength standard and non-standard fasteners, automotive hardware, and custo... Founded in Jiaxing, Zhejiang Province—one of China’s central manufacturing hubs for mechanical hardware—Jiaxing Xinchuang Hardware Co., Ltd. is a professional manufacturer and exporter specializing in high-strength standard and non-standard fasteners, automotive hardware, and custo...
