Heavy Duty Carbon Steel Hex Head Flange Internal Expansion Anchor Bolt - China Suppliers & Factory Direct

Name: External Hex Head Flange Internal Expansion Anchor Bolt
Material: High Strength Carbon Steel / 304/316 Stainless Steel
Standards: GB / DIN / ANSI
Grade: Carbon Steel: Grade 4.8 / Grade 8.8 (High Strength), Stainless Steel: A2-70 (30/ A4-80 (316)
Specifications: M6-M20 (Length typically from 50mm to 200mm)
Surface Treatment: Available in yellow zinc coating, blue-white zinc coating, hot-dip galvanizing, Dacromet coating, and natural polished stainless steel finish
Design Features: Designed with an external hexagonal flange and flat head, featuring a diamond knurled anti-slip texture, built-in wedge-shaped expansion joint, offering high tensile and shear strength, along with exceptional rust and corrosion protection
Applications: Ideal for flooring and ground fixing, steel structure and building reinforcement, outdoor railings and enclosures, heavy machinery, equipment installation, curtain walls, and billboards
Delivery Time: 15-30 days after advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces (negotiable)
Samples: Available upon request
Packaging: Standard packaging includes boxed, bulk, pallet, or customized options
OEM: Available for customized orders
Supplier: Leading manufacturer and factory in China

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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

Precision Fastening, Engineered for the Future – Sichuan Jingguda Fasteners Co., Ltd., Your Trusted High-Quality Fastener Expert

Sichuan Jingguda Fasteners Co., Ltd. is a professional fastener manufacturer integrating R&D, production, and sales. We specialize in high-precision, high-strength bolts, nuts, washers, and non-standard customized fasteners, covering international standards such as GB, DIN, ISO, ANSI, and ASME. Equipped with multi-station cold heading machines, high-speed thread rolling machines, fully automated heat treatment lines, and surface treatment equipment, we also operate an in-house laboratory featuring spectrometers, hardness testers, tensile testing machines, and salt spray testers to ensure strict quality control from raw materials to finished products.

Industrial Capabilities

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Factory Area: 8,000 square meters

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Certifications: ISO, IATF, CE, RoHS, JIS, ASTM

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Manufacturing: 70+ advanced production lines

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Testing: 30+ sets of precision equipment

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Annual Output: Up to 50,000,000 tons

From Raw Material to Finished Product

Our factory's fully automated production lines for cold heading, precision thread rolling, controlled-atmosphere heat treatment, and environmentally friendly surface finishing enable closed-loop manufacture from raw material to finished product. Because of inline optical sorting and a digital MES, every fastener meets stringent standards for strength, accuracy, and surface quality. You guarantee the best fasteners—reliable, efficient, and eco-friendly.

Innovation Lab:

Are you working on a project? Let's move forward now. Our development is fueled by talent and teamwork, and we are always looking for new ideas. Do you have a project underway? Let's move forward now.

"Pain Point Diagnosis" to "Customized Implementation"

We provide more than just standard parts. From the beginning of your project, our multicultural engineering team actively collaborates. We carefully consider the application environment and customize solutions in the lab, fully integrating technology and application, to guarantee that innovative ideas are quickly transformed into practical solutions that reduce overall lifetime costs.

Integrated Verification System

The creative process doesn't stop at the drawing board. We offer one-stop verification for everything from corrosion testing to prototype development through our internal technical center. We employ empirical data to verify the performance stability of customized solutions through comprehensive simulated working condition tests. In addition to achieving genuinely dependable cost reduction and efficiency improvement, this greatly lowers project risks.

Quick Service Reaction

Utilize self-developed molds and flexible manufacturing lines to finish sample and delivery within 7 days; strategically plan production using digital quality control and agile supply chains to cut bulk order delivery time by 30% following confirmation. With our "Demand-Solution-Sampling-Production" closed-loop system, you might be able to capitalize on market opportunities for both regular bolts and custom-shaped parts.

Frequently Asked Questions

❓ What types of fasteners do you specialize in?

We specialize in high-precision, high-strength bolts, nuts, washers, and non-standard customized fasteners, complying with GB, DIN, ISO, ANSI, and ASME standards.

❓ What is your production capacity?

With over 70 advanced production lines and an 8,000 square meter facility, our annual output reaches up to 50,000,000 tons.

❓ Do you provide customized R&D solutions?

Yes, we offer a "Pain Point Diagnosis" to "Customized Implementation" process. Our multicultural engineering team works directly with you to create tailored solutions in our lab.

❓ How do you ensure the quality of your fasteners?

We operate an in-house laboratory with spectrometers, hardness testers, and salt spray testers. We also use a digital MES and inline optical sorting for 100% quality assurance.

❓ What is your typical lead time?

We provide a quick service reaction, finishing samples within 7 days. Our agile supply chain allows us to reduce bulk order delivery times by 30% after confirmation.