What products does Youlong manufacture?

Youlong manufactures photovoltaic mounting components such as aluminum guide rails, water channels, angle brackets and connectors, plus precision fasteners including anchor bolts, carriage bolts, expansion bolts, flat washers and wing nuts for solar, wind power and construction projects.

Can you produce custom PV brackets and fasteners to my drawings?

Yes. Our automated stamping, forging and CNC machining lines support OEM and custom production. Send drawings or samples with material, finish and quantity requirements, and our engineers will confirm feasibility, tolerances and a written proposal.

How do you control the quality of fasteners for outdoor solar projects?

We run random inspections from raw material intake to final dispatch and test against industry standards, including salt spray corrosion testing and tensile strength testing, so that hardware performs reliably in long-term outdoor exposure.

Which material should I choose for coastal or high-humidity PV sites?

For coastal, offshore or industrial sites with high corrosion categories, stainless steel grade 316 (A4) fasteners are generally recommended. For inland sites, 304 (A2) stainless or hot-dip galvanized carbon steel is commonly specified. Isolating washers help prevent galvanic corrosion between aluminum rails and steel hardware.

Where is Youlong located and do you export worldwide?

Youlong is located in Yongnian District, Handan City, Hebei Province, known as China's Fastener Capital. We have served more than 100 clients worldwide with cumulative shipments exceeding 300,000 tonnes.

Best Heavy-Duty Fish Scale Expansion Bolt - High-Strength Carbon Steel Supplier from China | Factory Direct Stability Solutions Manufacturer, Factory

1 / 4

Best Heavy-Duty Fish Scale Expansion Bolt - High-Strength Carbon Steel Supplier from China | Factory Direct Stability Solutions Manufacturer, Factory

Introducing our heavy-duty fish scale expansion bolt, designed specifically for superior performance in construction applications. This innovative product features an anti-slip scale design, ensuring a strong gripping force that prevents loosening and enhances stability. Crafted from high-strength carbon steel, our expansion bolt is ideal for fixing hollow bricks, porous bricks, and lightweight walls. This guarantees a firm installation with a long service life, making it an essential choice for construction, ceiling, and pipeline support projects. As a leading factory in China, we are proud to supply durable and reliable expansion bolts to meet the demands of professionals in the industry. Trust our products for your next project, and experience the quality that sets us apart among suppliers

Send Inquiry

Product Description

Product Application

Widely used for ceiling suspension, pipeline bracket fixing, shelf installation, curtain wall keel and lightweight wall fastening in construction engineering and interior decoration.

Specifically designed for hollow bricks, porous bricks, aerated concrete blocks and other lightweight wall bases, solving the problem of easy slipping of ordinary expansion bolts.

Suitable for indoor and outdoor building fixing scenarios, providing reliable support for hanging objects, mechanical equipment accessories and decorative components.

Ideal for engineering renovation, home decoration and equipment maintenance, adapting to various thin-walled and porous base environments with poor fastening conditions.

Compatible with standard threaded rods and installation tools, meeting the fastening needs of construction sites and decoration projects with high stability requirements.

Material & Processing Features

Manufactured from high-grade carbon steel with quenching treatment, featuring high hardness, strong tensile strength and good toughness, not easy to break under load.

Unique fish scale anti-slip texture on the expansion sleeve, enhances friction with the base, effectively prevents backward slipping and improves fastening stability.

Precision stamping and integrated molding process, uniform expansion sleeve thickness, strict dimensional tolerance control, ensuring consistent expansion effect.

Standard hexagonal head design fits common wrenches, labor-saving installation, smooth and neat threads for tight fitting with nuts.

Surface galvanized anti-rust treatment improves corrosion resistance, suitable for humid indoor and general outdoor environments, prolonging service life.

Core Product Benefits

Fish scale anti-slip design greatly enhances the gripping force on lightweight walls, effectively disperses stress, avoids falling off and ensures construction safety.

Strong adaptability to special bases, solves the fastening difficulty of hollow and porous walls, and expands the application scope of expansion bolts.

High-strength structure delivers excellent load-bearing performance, resists vibration and loosening, maintaining long-term stable fastening.

Simple installation process, no complex operation required, suitable for on-site construction, improving overall project efficiency.

Complete specifications with various diameters and lengths, supporting customized processing to match different wall thicknesses and load-bearing needs.

Comply with international building fastener standards, passing tensile test and load test, with stable quality and cost-effective performance.

Detail Pictures

Frequently Asked Questions

What makes fish scale expansion bolts different from standard ones?

The unique fish scale texture on the sleeve provides significantly higher friction, preventing the bolt from slipping or rotating in hollow or porous materials where standard bolts often fail.

Can these bolts be used in aerated concrete or hollow bricks?

Yes, they are specifically engineered for lightweight bases such as hollow bricks, porous blocks, and aerated concrete, ensuring a secure and stable fix.

Are these bolts resistant to rust and corrosion?

Yes, the surface undergoes a professional galvanized treatment, making them suitable for both humid indoor environments and general outdoor construction.

What material are the bolts made from?

They are manufactured from high-grade carbon steel that has undergone a quenching process to ensure high hardness and superior tensile strength.

Do they meet international construction standards?

Absolutely. Our expansion bolts comply with international building fastener standards and have passed rigorous tensile and load-bearing tests.

Best Heavy-Duty Fish Scale Expansion Bolt - High-Strength Carbon Steel Supplier from China | Factory Direct Stability Solutions Manufacturer, Factory

Product Description

Product Application

Material & Processing Features

Core Product Benefits

Detail Pictures

Frequently Asked Questions

Related Products

Best High-Quality Stainless Steel Flat Washer - China Suppliers & Factory for Pressure and Corrosion Resistance Manufacturer, Factory

Best High-Quality Aluminum Alloy Angle Bracket for Solar PV Systems - China Suppliers & Factory Manufacturers, Factory

China Durable Solar PV Mounting Purlin Connector - High Strength, Adjustable, Anti-Corrosion | China Suppliers and Factory Manufacturers, Suppliers

Best China Heavy-Duty Fish Scale Expansion Bolt - High-Stability Fasteners from Reliable Suppliers and Factory Manufacturer, Manufacturers

Buy Heavy-Duty Hot-Dip Galvanized Carriage Bolt - China Factory Supplies for Superior Corrosion Resistance Suppliers, Companies

Best China Suppliers Heavy-Duty Stainless Steel Angle Bracket for Solar PV Mounting - Quality Factory Direct Connection Solutions Manufacturers, Suppliers

China High-Strength Hex Bolt from China Factory - Reliable Fasteners from Trusted Suppliers Company, Companies

Best China Stainless Steel Solar PV Mounting Hoop - Heavy-Duty Adjustable Clamp from Trusted Suppliers and Factory Manufacturer, Company

China High-Strength Aluminum Alloy Solar PV Mounting Base - Durable Support from China Suppliers and Factory Suppliers, Companies

Buy China Suppliers Factory Custom Trapezoidal Metal Roof Clamp for Solar PV Installation - No Drilling Required Company, Product