China Suppliers Factory 410/304 Stainless Steel Countersunk Self-Drilling Screws - Phillips Flat Head Self-Tapping

Name: High-Quality Stainless Steel Countersunk Phillips Self-Drilling Tek Screw
Material: Premium 410 Stainless Steel / 304 Stainless Steel
Standards: Manufactured to DIN 7504P / ANSI / ASME specifications
Grade: 410 (ideal for high hardness and self-drilling torque) and 304 (A2-70 for corrosion resistance)
Sizes: Available in M3.5, M4.2, M4.8, M5.5, M6.3 (equivalent to American Standard #6, #8, #10, #12, #14), Length options range from 13mm to 120mm
Surface Treatment: Expertly Electropolished / Passivation Treatment for enhanced durability
Design Features: Self-drilling design eliminates the need for pre-drilling; countersunk head provides a smooth finish; options for high-quality 410 and 304 stainless steel; tight threaded anti-slip interlocking ensures secure fastening; mirror passivation prevents rust effectively.
Applications: Ideal for use in light steel keel and steel structure ceilings; furniture and sheet metal assembly; installation of metal doors, windows, and curtain walls; automobile manufacturing; outdoor advertising and signage.
Delivery Time: 15-30 days post advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, flexible upon negotiation
Samples: Available for assessment
Packaging: Offers boxed, bulk, pallet, or customized packaging options
OEM: Custom manufacturing 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.

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

Dual Stainless Steel Options – High Hardness or Superior Corrosion Resistance

Available in 410 and 304 stainless steel. 410 grade, heat-treated for high hardness, delivers high driving torque to penetrate thick steel sheets and light-gauge studs without tip wear or breakage; 304 grade (A2-70) offers excellent corrosion resistance for damp, salt-spray, and outdoor environments – rust-free for decades. One screw, two materials – choose according to working conditions, meeting both hardness and anti-corrosion needs.

Self-Drilling Tip – No Pre-Drilling, Efficient One-Step Installation

The built-in self-drilling tip penetrates light-gauge steel, thin metal sheets, aluminum profiles, and sheet metal directly – no pre-drilling or punching needed. An electric driver completes drilling, tapping, and fastening in one step – several times faster than conventional self-tapping screws. Ideal for high-volume assembly in drywall framing, metal windows/curtain walls, and automotive manufacturing – significantly boosting productivity.

Countersunk Flat Head – Flush Fit, Aesthetic & Non-Interfering

The countersunk flat head fully embeds into the workpiece surface, sitting flush with metal panels, profiles, or curtain walls – no protrusion, sleek appearance, and no interference with subsequent painting, film application, or decorative finishing. Burr-free head prevents scratching of operators and materials. Tight threads provide anti-slip locking against vibration, maintaining clamping force long-term – perfect for furniture sheet metal, signboards, and other high-aesthetic applications.

Factory Environment

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High-Quality Stainless Steel Self-Tapping Screw Display

Frequently Asked Questions

Q What stainless steel grades are available for these self-drilling screws?

We supply both 410 and 304 (A2-70) stainless steel options. Grade 410 is heat-treated to provide high hardness and torque for penetrating light-gauge steel and thicker plates without tip wear, while Grade 304 delivers superior corrosion resistance for humid, salt-spray, and outdoor applications.

Q Is pre-drilling required prior to installation?

No pre-drilling or punching is required. The integrated self-drilling point directly penetrates light-gauge studs, aluminum profiles, and metal sheets in a single operation using an electric driver, significantly speeding up assembly line productivity.

Q What are the main advantages of the countersunk flat head design?

The countersunk flat head seats completely flush with workpiece surfaces, creating a clean look without protruding edges. This prevents interference with downstream painting, protective films, or decorative covers while eliminating burr scratches during handling.

Q What customization capabilities do you provide?

We offer comprehensive flexible customization, including customized head and slot configurations, special alloy applications, extra-large or extra-long specifications, custom surface finishes/colors, and tailored packaging with private labeling.

Q How is quality guaranteed throughout your manufacturing process?

Our manufacturing is backed by strict raw material source locking, 100% furnace number batch traceability, 3rd party material certifications, real-time salt spray monitoring, fully automated optical sorting, and dedicated metallographic/mechanical laboratory testing.

Q What engineering and technical services are offered?

Our technical services encompass free sample manufacturing and testing, on-site failure analysis, fastener selection calculations, BOM optimization, installation tool guidance, and Vendor Managed Inventory (VMI) support.