High Precision Expansion Bolt stainless steel anchor bolt Concrete anchor bolt

This series of stainless steel external expansion screws (also known as sleeve-type expansion bolts) are high-strength permanent fixation fasteners specially designed for hard substrates such as concrete and brick walls. They adopt an integrated combination structure of "threaded rod + expansion sleeve + nut + flat washer + spring washer", and during installation, by tightening the nut, the conical threaded rod is pulled to make the end of the sleeve expand uniformly and tightly bite the wall or ground hole, forming high friction and mechanical bite force, achieving firm fixation of equipment, supports and walls/ground.

The product is made of high-quality 304 stainless steel in one piece, with a bright surface without coating, native resistance to salt fog and corrosion, suitable for complex working conditions such as damp, acidic and alkaline, and outdoor; the expansion sleeve has uniform slit openings, and when under force, it can expand uniformly synchronously to avoid local cracking; the threaded rod's thread adopts a precise rolling process, bites tightly without slippage, and is paired with a dual anti-loosening structure of flat washer and spring washer. After installation, it is not prone to loosening and falling off, and is a universal core component for heavy-duty fixation in industrial, construction, outdoor facilities and other scenarios.

Core structure: Integrated combination of screw, expansion sleeve, nut, flat washer and spring washer. When tightening the nut, the sleeve expands uniformly, forming a mechanical interlock fixation.

Material configuration: The screw, sleeve, nut, flat washer and spring washer are all made of 304 stainless steel. The surface is passivated for rust prevention and corrosion resistance.

Specification coverage: Complete thread specifications include M6, M8, M10, M12, M16, M20. The length is 60-200mm and can be selected. It is suitable for different substrate thickness and fixation depth.

Performance: High strength tensile force / shear force resistance, uniform expansion and interlock fixation, anti-loosening and anti-vibration, corrosion resistance, no loosening during long-term use, suitable for concrete / brick wall substrates.

Installation compatibility: Standard drill bit drilling, tightening the nut completes the installation. No special tools are required. Single person can operate. Suitable for batch construction scenarios.

Stainless steel has inherent rust prevention properties and is suitable for complex working conditions.

It is made of 304 stainless steel, with a chromium content of 18%-20%. The surface is treated with passivation, which makes it resistant to salt fog, acid and alkali corrosion. It is not affected by outdoor sun exposure, rain, or coastal high humidity salt fog environments. It will not rust or corrode over a long period of use, significantly reducing the cost of later maintenance and replacement. It can be used for projects with the same lifespan as the engineering.

Uniform expansion and tight fit, high-strength fixation without loosening

The expansion sleeve has uniform slit openings and strong toughness. When tightening the nut, the sleeve can expand uniformly at the same time, closely fitting with the concrete / brick wall hole wall, forming a powerful mechanical bite force and friction force. It has excellent tensile and shear performance and is suitable for heavy equipment and high-frequency vibration working conditions. It is not likely to loosen or fall off over a long period of use.

Dual anti-loosening structure, suitable for vibration working conditions

The matching stainless steel flat washer + elastic washer dual anti-loosening components increase the contact area of the flat washer to disperse the tightening pressure and avoid damaging the surface of the workpiece; the elastic washer provides elastic preload force to counteract the vibration impact during equipment operation and prevent the nut from loosening. It is suitable for vibration working conditions such as motors and equipment brackets.

Installation is convenient and efficient, no need for complex tools

After drilling with a standard drill bit, insert the expansion screw and tighten the nut to complete the installation. No special equipment is required, and a single person can operate. Each installation only takes a few minutes and is suitable for batch fixed scenarios such as construction and equipment installation, significantly improving construction efficiency.

Wide range of specifications, strong versatility

The thread specifications cover M6-M20, with a length of 60mm-200mm available. It is suitable for different substrate thicknesses and fixation depths. It can be flexibly selected according to the fixation requirements without the need for additional customized accessories, reducing procurement and inventory costs.

Safe and stable, suitable for permanent fixation scenarios

The stainless steel material has no coating detachment risks. The expansion bite structure does not damage the base material structure. After installation, it is firmly and reliably. It can be used in scenarios such as guardrails, brackets, and equipment that require long-term stable fixation. Its safety and stability meet industry standards.

1. Infrastructure Projects: Anchor bolts are essential in infrastructure projects such as roads, railways, and airports. They are used to secure bridge piers, retaining walls, and other structural elements, ensuring the stability and safety of these critical infrastructure systems.

2. Industrial Facilities: In industrial facilities, anchor bolts are used to anchor heavy machinery, storage tanks, and other equipment. The high load-bearing capacity and durability of our anchor bolts make them suitable for these demanding industrial applications.

3. Historical Restoration: In historical restoration projects, our anchor bolts can be used to reinforce and stabilize old structures. They can be installed in a way that is sympathetic to the original design and materials, ensuring the preservation of historical buildings while providing the necessary structural support.

4. Solar and Wind Energy Projects: Anchor bolts play a crucial role in solar and wind energy projects. They are used to secure solar panels, wind turbines, and their foundations, ensuring that these renewable energy systems can withstand the forces of nature and operate reliably.

Q1: Can your anchor bolts be used in seismic zones?

A: Yes, our anchor bolts can be used in seismic zones. We offer anchor bolts that are designed to withstand seismic forces. These bolts are engineered to have a certain degree of flexibility and energy absorption capacity to help structures resist the shaking and vibrations caused by earthquakes. However, it is important to follow the appropriate design and installation guidelines for seismic applications, and our technical team can provide you with more information and assistance.

Q2: What is the minimum embedment depth for your anchor bolts?

A: The minimum embedment depth of our anchor bolts depends on several factors, including the type of base material, the size and design of the bolt, and the load requirements. Generally, for concrete, the embedment depth should be sufficient to ensure the required pull-out resistance. You can refer to our product documentation or consult our technical team for specific embedment depth recommendations for your application.

Q3: Are there any special storage requirements for your anchor bolts?

A: Our anchor bolts should be stored in a dry and clean place. They should be protected from moisture, direct sunlight, and corrosive substances. If possible, store them in their original packaging or in a sealed container to prevent rust and damage. Avoid stacking them in a way that could cause deformation or damage to the threads or the anchor end.

Q4: Can I use your anchor bolts with other types of fasteners?

A: In some cases, it may be possible to use our anchor bolts in combination with other types of fasteners. However, it is important to ensure that the combination is compatible and that the overall performance of the fastening system meets the requirements of the application. You should consult with our technical team or a professional engineer to determine the feasibility and safety of using multiple fasteners together.