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EXPANSION ANCHORS & PLUGS Factory

Expansion screws, also known as expansion bolts or expansion anchors, are a type of fastener widely used to fix items to walls or other substrates. They are particularly suitable for installing heavy objects on substrates such as brick walls, concrete or gypsum boards. Its working principle is based on the expansion effect, that is, when the screw is tightened, the expansion part expands and grabs the surrounding material to form a strong fixation. The structure of an expansion screw usually consists of several key parts: bolts, expansion sleeves, and nuts and washers included in some types. The bolt is the main metal part with external threads; the expansion sleeve is wrapped around the outside of the bolt and is usually made of plastic, metal or nylon. When the bolt is screwed in, the expansion sleeve expands to provide a strong fixation. Nuts and washers are used to further lock and fix the bolts and increase the stability of the installation. There are many types of expansion screws to meet different installation needs. Common types include metal expansion screws, plastic expansion screws and spiral expansion anchors. Metal expansion screws are used for heavy-duty applications, often on hard substrates such as concrete or brick walls; plastic expansion screws are used for lighter applications, suitable for gypsum board and other lightweight materials; spiral expansion anchors are often used to install lightweight items in drywall or hollow walls. Expansion screws are widely used in home decoration, construction projects and various installation tasks, and can provide a strong and reliable fixing effect. For example, in home decoration, expansion screws can be used to fix heavy objects such as bookcases, cabinets and TV stands. In construction projects, expansion screws are widely used to fix various equipment and structures, such as air conditioning units, pipe supports and guardrails.

About Us
Yuyao Cili Machinery Co., Ltd.

Yuyao Cili Machinery Co., Ltd. is located in Yuyao City, Zhejiang Province, on the south bank of Hangzhou Bay Bridge, the center of the economic triangle connecting Shanghai, Hangzhou, and Ningbo, with a geographical environment and convenient transportation. As China EXPANSION ANCHORS & PLUGS Manufacturers and EXPANSION ANCHORS & PLUGS Factory, the company has passed ISO9001-2008 quality management certification, the factory covers an area of 15,000 square meters, the factory has more than 200 employees, specializing in self-tapping self-drilling screws wood screws, and window expansion screws design and production, the company's annual output value of about 10 million US dollars, the monthly output of about 1000 tons.

Our factory has a full set of production equipment, including wire drawing, annealing cold beating, clamping, rolling, advanced equipment, professional technical personnel, and a quality inspection team to ensure we can provide customers with high-quality products. With many years of experience accumulated in the fastener industry, we can better according to the samples or drawings provided by customers and production.

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EXPANSION ANCHORS & PLUGS Industry knowledge

What is the specific principle of the products under the category of expansion anchors & plugs?

Yuyao Cili Machinery Co., Ltd., specializes in the design and production of self-drilling screws, wood screws and window expansion screws. From raw material procurement to finished product delivery, every link strictly follows international standards and strives to be perfect. In order to continuously improve product quality and production efficiency, we have introduced a full set of advanced production equipment, including wire drawing machines, annealing and cold-forging equipment, clamping devices and rolling machines. The use of these high-tech equipment has greatly improved the automation level of the production line and provided us with strong technical support and quality assurance. Among the many product categories, EXPANSION ANCHORS & PLUGS are our key solutions for the construction and industrial fields. They help customers achieve efficient and stable fixation on various substrates through innovative expansion principles. The following will introduce in detail the working principle of expansion anchors and expansion plugs and their wide application.

1. Working principle of expansion anchors
Expansion anchors are fasteners designed for fixing to hard or semi-hard substrates. It uses the external force during installation to mechanically expand the anchor bolt, and then embed it into the substrate to achieve stable fixation.
Structure of expansion anchor bolt: The expansion anchor bolt consists of a bolt body, an expansion tube (or expansion sleeve), a nut and other components. Its core is the expansion tube. During the installation process, as the nut is tightened, the expansion tube expands outward and firmly grasps the wall of the substrate hole.
The installation steps of the expansion anchor bolt are as follows.
Drilling: Drill a hole on the surface of the substrate that matches the diameter of the expansion anchor bolt, and ensure that the hole depth is sufficient to accommodate the expansion anchor bolt.
Inserting the anchor bolt: Insert the expansion anchor bolt into the pre-drilled hole to ensure that the expansion tube completely enters the hole.
Tightening the nut: Use a wrench or other tool to tighten the nut. As the nut rotates, the screw of the anchor bolt is pulled, and the expansion tube expands radially and begins to cling to the hole wall.
Fixing is completed: The expansion effect of the expansion tube forms a strong friction and physical locking force with the wall of the substrate hole, allowing the anchor bolt to be firmly embedded in the substrate.
The key to the expansion anchor bolt lies in its "expansion" characteristics. During installation, as the nut rotates, torque is transmitted to the expansion tube through the screw, causing it to expand outward. This expansion action ensures that sufficient friction and locking force are generated between the expansion tube and the hole wall, so that the anchor bolt is firmly fixed. This ingenious combination of torque transmission and expansion effect is the basis for the expansion anchor bolt to withstand high loads.
Expansion anchor bolts are usually made of stainless steel, carbon steel or galvanized steel. Different materials are suitable for different use environments. For example, stainless steel expansion anchor bolts are suitable for humid or highly corrosive environments, while carbon steel expansion anchor bolts are more economical and suitable for ordinary indoor environments.

2. Working principle of expansion plug
Expansion Plug is a fastener suitable for softer substrates (such as wood, gypsum board, hollow brick, etc.), which is fixed by the expansion of flexible materials. This type of product is usually made of plastic or nylon. During installation, the expansion plug is expanded outward by the squeezing force of the screw, thereby forming a close fit with the substrate.
The expansion plug is usually hollow in design, and its outer wall has expansion ribs to facilitate its expansion outward when the screw is screwed in and embedded in the substrate hole wall.
The installation steps of the expansion plug are as follows.
Drilling: Drill a hole on the substrate according to the diameter of the expansion plug. The hole diameter is usually slightly smaller than the outer diameter of the expansion plug to ensure the expansion effect.
Insert the expansion plug: Insert the expansion plug into the drilled hole to ensure that it fits tightly to the substrate.
Screw in the screw: When the screw is screwed into the expansion plug, the thread of the screw pushes the expansion plug to expand outward and embed into the hole wall of the substrate.
Fixing completed: The outer wall of the expansion plug is in close contact with the hole wall, and the friction and embedding force work together to form a stable connection.
Expansion plugs are usually made of plastic or nylon. These materials have good elasticity and tensile strength, and can provide a stable fixing effect in light load scenarios.

III. Application scenarios of EXPANSION ANCHORS & PLUGS
Expansion anchors and expansion plugs are widely used in many fields, including.
Construction field: Expansion anchors are widely used in the fixation of building structures, such as concrete walls, ceilings, steel frame structures, etc., especially suitable for occasions that need to bear large loads. Expansion plugs are more used for the installation of light structures, such as lamps, frames, curtain rods, etc.
Home decoration: Expansion plugs are also very common in home decoration. They are suitable for fixing softer substrates such as hollow walls and wood to ensure that the screws can remain stable under light loads.
Industrial equipment installation: In industrial equipment installation, expansion anchors are used to fix the base and brackets of machinery and equipment to ensure that the equipment does not shift during operation.

IV. Advantages of our products
The expansion anchors and expansion plugs produced by Yuyao Cili Machinery Co., Ltd. have the following significant advantages.
High-strength materials: We use high-strength materials such as high-quality carbon steel and stainless steel to ensure that the products have excellent durability and corrosion resistance.
Precision machining: Our factory is equipped with advanced production equipment, which can perform precision machining and quality control on each expansion anchor and expansion plug to ensure that the dimensional accuracy and mechanical properties of the products meet international standards. Each expansion anchor and expansion plug undergoes strict testing before leaving the factory to ensure that it can withstand high loads during use and maintain stability for a long time.
Multiple specifications to choose from: In order to meet the needs of different customers and different application scenarios, we provide expansion anchors and expansion plugs of various specifications and models. Whether it is used for construction projects, home decoration, or industrial equipment installation, our products can provide perfect fixing solutions.
Personalized customization service: With our years of industry experience and technical accumulation, we are able to quickly respond and produce customized products that meet customer needs based on the drawings or samples provided by customers. We are well aware of the uniqueness of each project, so we provide customers with tailor-made services to ensure that the products can perform at their best under various complex conditions.