Stainless Steel Hex Flange Self-Drilling Screws with EPDM Washer - China Suppliers & Factory Direct Pricing

Product Name: Stainless Steel Hex Flange Self-Drilling Screw with EPDM Washer
Materials: Crafted from 410 and 304 Stainless Steel for durability
Standards: Complies with DIN 7504-K, ISO 15480, and GB/T 15856.2
Grades: 410 (High Hardness HV 400-500), 304 (A2-70)
Sizes Available: M4.2 (#8), M4.8 (#10), M5.5 (#12), M6.3 (#14), with lengths ranging from 13mm to 200mm
Surface Treatment: Electropolishing and Passivation to enhance corrosion resistance
Design Features: Hexagonal flange head for high torque application, EPDM Rubber sealing gaskets for waterproofing, high-hardness self-drilling tines, precision anti-slip threads, and a dual-material anti-corrosion system
Applications: Ideal for light steel structures, color steel plate roofs, outdoor fencing, electromechanical equipment enclosures, large outdoor advertising signage, and wood-steel structural combinations
Delivery Time: Fast delivery within 15-30 days after advance payment
Origin: China, from trusted suppliers and factory
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable based on your needs
Samples: Available upon request
Packaging: Offered in boxed, bulk, pallet, or customized options
OEM: Custom manufacturing solutions available

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Key Features

Our self-tapping screws are crafted from food-grade 304 stainless steel and treated to achieve metric Grade 12.9 ultra-high strength, overcoming the traditional hardness limitations of standard stainless steel. Featuring a countersunk Phillips head design, these screws can be installed flush with the workpiece surface for a zero-profile finish, making them ideal for precision electronics and architectural decoration. We have optimized the thread geometry for different substrates (metal, wood) to ensure low-torque driving with high-torque clamping, effectively preventing stripping. As a superior alternative to standard Tek screws, these fasteners perform exceptionally well in thin sheet metal connections, providing an intelligent fastening solution that balances aesthetics with high load-bearing capacity.

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Precision Manufacturing Process

From wire rod to finished product, we strictly adhere to multiple international standards including ISO, DIN, ANSI, and GB. Utilizing multi-station cold forging technology, we ensure shank diameter tolerances are controlled within microns. Threads are formed through a precision thread rolling process to enhance fastening force. For non-standard requirements, we employ optical imaging sorters to reject minute defects like head cracks. In post-treatment, we offer a wide range of surface finishing options: from conventional zinc plating and nickel plating to highly corrosion-resistant Hot-Dip Galvanizing (H.D.G.), as well as decorative polishing and black anodizing. We even provide food-grade passivation treatment, ensuring every screw has a prolonged fatigue life in demanding environments.

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Transparency & Customization

As a source factory, we are committed to breaking down the information barriers of traditional trade. From mill certificates for raw materials to hardness grades (covering Grade 4.8 to Grade 12.9, as well as A2-70 and A4-80 marine-grade stainless steel), all test data is traceable. We support full-chain customization: dimensionally, we can adjust thread length and head thickness according to drawings; functionally, we can combine processes like sandblasting, electrophoretic coating (e-coating) , or chrome plating. Whether you need British Standard (BS) fasteners or require a special colored anodized finish, we offer small-batch sampling. This ensures that when you purchase fasteners from us, you not only receive high-quality products but also full transparency and control over the entire process, from material selection to packaging.

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No Pre-Drilling · Rust Resistant · More Secure

This stainless steel Phillips countersunk self-tapping screw, with its rust-resistant and corrosion-resistant material, one-step self-tapping design, and aesthetically pleasing countersunk head structure, has become the preferred solution for metal substrate fastening scenarios that is efficient, reliable, and aesthetically pleasing.

Product Details

⚙️ Manufacturing Process

Multi Station Cold Heading Technology
Intelligent Heat Treatment System
Micron-Level Thread Rolling Process
Fully Automatic Optical Sorting
Environmentally Friendly Surface Treatment Line
Metallographic And Mechanical Joint Laboratory

🛡️ Quality Control System

Raw Material Source Locking
Furnace Number Batch Full Traceability
Third Party Material Certification
Process Parameters Open And Transparent
Salt Spray Test Real Time Monitoring
International Standard Compliance Declaration

🎨 Flexible Customization

Customizable head/slot Shapes
Extreme Application Of Special Materials
Breakthroughs In Extra Large/Long Specifications
Integrated Assembly Of Components
Customizable Surface Treatment Colors
Personalized Packaging And Labeling

🛠️ Technical Service

On-Site Failure Analysis
Selection Calculation And BOM Optimization
Installation Tool Selection Guidance
Inventory Management (VMI) Trusteeship
Free Sample Making And Testing
International Standard Translation And Interpretation

💎 Dual Stainless Steel Options

Available in 410 stainless steel (HV 400-500, high torque and penetration for heavy-duty driving) and 304 stainless steel (A2-70, excellent salt-spray resistance for coastal/outdoor use). Whether prioritizing high-strength penetration or long-term anti-corrosion, there's a solution. With electro-polishing/passivation, the surface stays bright and rust-free – reliable and durable on steel roofing, outdoor fences, and electrical enclosures.

🚀 Self-Drilling Tip + Hex Flange

The hardened self-drilling tip penetrates light-gauge steel, color-coated steel sheets, and aluminum profiles directly – no pre-drilling, with drilling, tapping, and fastening completed in one step by an electric driver. The hex flange head fits power wrenches for high torque without cam-out; bottom anti-slip teeth bite into the substrate, effectively resisting wind pressure, mechanical vibration, and thermal expansion.

💧 EPDM Pre-Installed Sealing Washer

The integrated EPDM rubber washer deforms under compression, tightly conforming to the hole wall and panel surface to form an elastic seal that completely blocks rain, moisture, and condensation ingress. EPDM resists ozone and UV, maintaining elasticity from -40°C to 120°C without aging or cracking for decades. Perfect for steel roofing, outdoor signboards, and fences – eliminating leakage risks.

Factory Environment

High-Quality Stainless Steel Self-Tapping Screw Display

Frequently Asked Questions

Q1: What is the difference between 304 and 410 stainless steel screws? A: 410 stainless steel is hardened for high torque and better penetration in heavy-duty applications, while 304 stainless steel offers superior corrosion resistance, making it ideal for coastal or outdoor environments.

Q2: Do these self-tapping screws require pre-drilling? A: No, the hardened self-drilling tip is designed to penetrate steel sheets and aluminum profiles directly, completing drilling, tapping, and fastening in one step.

Q3: How long does the EPDM sealing washer last? A: EPDM is highly resistant to UV and ozone. It maintains its elasticity in temperatures ranging from -40°C to 120°C, providing a leak-proof seal for decades without cracking.

Q4: Can I customize the head shape or color of the screws? A: Yes, we offer flexible customization for head/slot shapes, surface treatment colors, and personalized packaging to meet your specific project requirements.

Q5: How do you ensure the quality and traceability of the products? A: We implement a full traceability system based on furnace batch numbers, source locking for raw materials, and real-time salt spray test monitoring to ensure international standard compliance.

Q6: Are these screws suitable for high-vibration environments? A: Yes, the hex flange head combined with bottom anti-slip teeth ensures a secure bite into the substrate, effectively resisting mechanical vibration and wind pressure.