304/316 Stainless Steel Wedge Anchor Bolt Heavy Duty Expansion Anchor for Concrete Elevator & Construction Fastening A2/A4 Grade

Name: Wedge Anchor Bolt
Material: AISI 304/316，SWRCH35K/45# Carbon Steel
Standards: GB/T 22795, ETAG 001, ASTM F1554
Grade: Stainless steel A2 (304) / A4 (316), Carbon steel 8.8 / 10.9
Specifications: M6–M20，40mm ~ 300mm (customizable)
Surface Treatment: Natural polishing (no additional plating, corrosion resistant), electroplating / Hot-dip galvanizing (optional)
Design Features: Wedge self-locking structure, full thread design, corrosion resistance, easy installation, shockproof and anti-loosening
Applications: Construction engineering, elevator industry, infrastructure, outdoor / humid environments
Delivery Time: 15-30 days after receiving advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available
Packaging: Boxed/Bulk/Pallet or customized packaging
OEM: Available

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws01

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws02

Key Features

Our stainless steel wedge anchors (AISI 304/316) and heavy‑duty expansion anchors (optional SWRCH35K carbon steel + hot‑dip galvanized) are specifically designed for concrete, elevator guide rails, bridges, and outdoor/humid environments. Size range M6–M20 with strength grades covering A2‑70 and A4‑80 (316 grade offers resistance to chloride corrosion). The core structure is a wedge‑type self‑locking expansion sleeve – installation simply requires drilling → hole cleaning → anchor insertion → tightening the nut with a preset torque wrench. The wedge expands under pressure, forming a 3‑D interlock with the concrete bore wall, with seismic performance verified to ETAG 001 Annex E (C1/C2 high fatigue loads). The full‑thread design allows free cutting to any depth, enabling post‑installed anchoring without pre‑embedding – ideal for dynamic load applications such as elevator shaft brackets, curtain wall substructures, and wastewater treatment tanks.

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.

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws05

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws06

Transparency & Customization

We insist on full transparency in our manufacturing process: customers can conduct video inspections of production, review raw material quality certificates and third-party testing reports. Each batch of goods is accompanied by a traceability code, tracing back to the steel strip furnace number and operator. For customization: square strips with side lengths of 10-120mm, hole diameters of M4-M24, and thicknesses of 0.5-8mm are available; deviations from standard mold openings are permissible (≤7 days); materials include duplex stainless steel, 8.8 grade carbon steel, etc.; surface coatings include Dacromet and Teflon. Minimum order quantity is as low as 10,000 pieces; 3D drawings and quotations are provided within 48 hours, with full traceability.

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws08

304 Stainless Steel Cross Recessed Countersunk Head Self-Tapping Screws07

Concrete-Specific · Seismic-Resistant · Anti-Loosening

Made of 304/316 stainless steel, A4 grade corrosion resistant. Wedge-shaped self-locking expansion joint, three-dimensionally interlocks with the concrete after installation, withstands dynamic loads. Suitable for elevator guide rails, curtain wall joists, and bridge railings. Fully threaded and cuttable, easy post-anchoring, meets ETAG C1/C2 seismic requirements.

product details

JGD Service

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

Material & Weather Resistance for Demanding Conditions

Our wedge anchors are available in two major material series: AISI 304/316 stainless steel and carbon steel. The 316 stainless steel version features outstanding resistance to chloride ion corrosion, easily withstanding highly corrosive environments such as coastal salt spray and wastewater treatment plants. The carbon steel version offers SWRCH35K/45# options with hot-dip galvanizing, balancing high strength and outdoor rust prevention. With strength grades A2-70 and A4-80, and sizes ranging from M6 to M20, they deliver long-lasting and reliable anchoring for applications from indoor elevator guide rails to humid outdoor curtain walls.

Wedge Locking Mechanism for High Load Capacity & Fatigue Resistance

Featuring a core wedge-locking expansion sleeve design, tightening the nut drives the wedge block to expand under pressure, forming a 3D interlocking bite with the concrete hole wall to significantly enhance anchoring force. The tested anti-seismic and anti-loosening performance fully meets the C1/C2 high-fatigue load requirements of ETAG 001 Annex E. In dynamic load scenarios such as elevator shaft brackets and bridge guardrails, they can stably withstand repeated alternating loads, preventing loosening or falling off even after long-term use, with ample safety redundancy.

Fully Threaded Post-Installed Design for Efficient & Flexible Installation

The fully threaded integrated design allows the cutting depth to be adjusted arbitrarily according to on-site working conditions, eliminating the need for pre-embedded components and greatly reducing pre-construction preparation costs. The installation process only requires four simple steps: drilling the hole, cleaning the hole, inserting the anchor, and tightening the nut to the specified torque. This post-installed solution is especially suitable for scenarios such as existing building renovations and elevator guide rail installations. With sizes covering M6 to M20, they flexibly adapt to different hole diameters and load requirements, offering excellent versatility.

Application Scenarios

High-Quality Stainless Steel Self-Tapping Screw Display

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

Chengdu Jingguda Trading 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. Our products are widely used in industrial machinery, renewable energy, automotive manufacturing, rail transportation, and more, known for their precision, corrosion resistance, and durability. Committed to “Fast Delivery, Professional Support,” we provide one-on-one customized solutions and efficient logistics, striving to be your ideal partner for reliable connections.

Industrial Capabilities

• Factory Area: 8,000 square meters

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

• Manufacturing : 70+ internationally advanced production lines

• Testing: 30+ sets of precision quality testing equipment

• Annual Output: Up to 50,000,000 tons

From Raw Materials to Finished Products

Our factory's fully automated production lines for cold heading, precision thread rolling, controlled-atmosphere heat treatment, and eco-friendly surface finishing enable closed-loop manufacturing 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 top-notch fasteners that are trustworthy, efficient, and ecologically conscious.

Lab for Innovation:

Our progress is fueled by expertise and teamwork, and we are always looking for novel solutions. Do you have a project? Now let's begin.

The Whole Collaborative R&D Process: From "Pain Point Diagnosis" to "Customized Implementation"

We provide more than just standard parts. From the beginning, our multicultural engineering team actively contributes to your project. We carefully analyze the application context and customize solutions in the lab, seamlessly fusing technology and application, to guarantee that innovative ideas are quickly transformed into practical solutions that reduce overall lifetime costs.

Integrated Verification System: Using "Test Data" to Ensure Innovation

The drawing board is not where the creative process ends. From corrosion testing to prototype development, we offer one-stop verification 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 Response

Using Self-Developed Molds and Flexible Production Lines to Complete Sampling and Delivery Within 7 Days; After Confirmation, Intelligently Schedule Production With Digital Quality Control And Agile Supply Chains To Reduce Bulk Order Delivery Time By 30%. Our "Demand-Solution-Sampling-Production" closed-loop service helps you take advantage of market opportunities for both standard bolts and custom-shaped parts.