Hardened Color Zinc Plated Self-Drilling Roofing Screws with EPDM Washers - China Suppliers Factory Direct

Product Name: Hex Washer Head Self-Drilling Roofing Screw with EPDM Washer
Material: High-Grade Hardened Carbon Steel
Standards: DIN 7504 / ISO 15480 / GB/T 15856.2
Grades: 8.8 / 10.9
Specifications: Diameter options include M4.2, M4.8, M5.5, M6.3 (Imperial sizes: #8, #10, #12, #14), Length ranges from 13mm to 200mm
Surface Treatment: High-gloss, environmentally friendly yellow zinc plating
Design Features: Features a hardened milled drill tip, EPDM integrated rubber sealing gasket, hexagonal flange with a large head design, easily identifiable custom markings, and specialized thread pitch with high-strength threads
Applications: Ideal for light steel structures and corrugated steel roofing/walls, outdoor billboards and large signs, ventilation ducts and HVAC engineering, timber roof trusses and outdoor facilities, as well as automotive modifications and vehicle manufacturing
Delivery Time: 15-30 days after receipt of advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces (negotiable)
Samples: Available upon request
Packaging: Options include boxed, bulk, pallet, or customized packaging
OEM Services: Available

As a leading supplier and factory for high-quality self-drilling roofing screws in China, we ensure that our products meet the highest standards in durability and performance. Our hex washer head screws are the perfect choice for various construction and manufacturing applications.

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws02

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.

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws03

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws04

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.

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.

Intelligent Warehousing Services for Fasteners

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 Capability

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

FEATURE 01

Hardened Drill Tip – One-Step Penetration, No Pre-Drilling

The drill tip is hardened and mill-cut, enabling direct penetration through steel sheets, light-gauge steel studs, and structural steel – no pre-drilling or punching needed. An electric drill or impact wrench completes drilling, tapping, and fastening in one step – several times faster than conventional self-tapping screws. Ideal for large roofs, wall panels, and ductwork, significantly shortening construction time and reducing labor costs – one person can work efficiently.

FEATURE 02

EPDM Pre-Installed Sealing Washer – Leak-Proof, Never Seeps

The integrated EPDM rubber washer deforms under compression, tightly conforming to the hole wall and panel surface, forming a 360° elastic seal that effectively blocks rain, moisture, and condensation ingress. EPDM resists aging, UV, and ozone, maintaining elasticity from -40°C to 120°C with a service life of decades. Perfect for steel roofing, outdoor signboards, and vehicle bodies – eliminating leakage risks.

FEATURE 03

Hex Flange Head + Anti-Slip Teeth – Vibration-Resistant & Stable Under Load

The hex flange head fits power wrenches for high torque and efficiency; bottom anti-slip teeth bite into the substrate during tightening, creating mechanical locking against wind pressure, vibration, and thermal expansion. Grade 8.8/10.9 hardened carbon steel offers high tensile strength for reliable heavy-load structures. Bright zinc plating provides corrosion and wear resistance – long-term outdoor use without rust, extremely low replacement frequency.

Factory Environment

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws 05

High-Quality Stainless Steel Self-Tapping Screw Display

Frequently Asked Questions (FAQ)

Q: What materials can the hardened drill-tip screws penetrate directly?

Our hardened drill-tip screws can penetrate directly through steel sheets, light-gauge steel studs, and structural steel without pre-drilling or punching, significantly saving labor and installation time.

Q: How does the EPDM washer ensure leak-proof performance outdoors?

The pre-installed EPDM washer forms a 360° elastic compression seal against water, humidity, and UV exposure. It withstands extreme temperatures from -40°C to 120°C for long-lasting outdoor weatherproofing.

Q: Can I order custom screw head types, coatings, or special dimensions?

Yes, we provide flexible customization including custom head/slot styles, extra-long specifications, customized surface coating colors, specialized material formulations, and customized packaging.

Q: How do you guarantee product quality and material traceability?

We lock raw material sources with full furnace number batch traceability, optical sorting, continuous salt spray test monitoring, and provide third-party material test certifications.

Q: Do you provide technical support and free testing samples before ordering?

Yes, we offer free sample making and testing, fastener selection calculations, BOM optimization, on-site failure analysis, and VMI inventory management support.