Nuts are fasteners used with bolts, mainly used to connect and fix mechanical parts. There are many types of nuts, which can be divided into the following categories according to different standards and functions:

Hexagonal nuts

The hexagonal nut has a hexagonal shape, and the six corners allow it to be rotated by tools such as wrenches and pliers. Its inner hole has threads that can match the threads of the corresponding bolts to form a stable connection. Hexagonal nuts are a common and powerful fastener. They are widely used in various industrial fields due to their simple structure, low cost and easy use. When selecting and using, the appropriate specifications and types should be selected according to factors such as load, environment, and material.

1. Function and use

The main function of the hexagonal nut is to fix and connect parts by matching with bolts. It is widely used in mechanical equipment, construction engineering, automobile manufacturing, and home appliance industries. Due to its simple shape and structure, it is very easy to install and disassemble, and is one of the most commonly used fasteners.

2. Advantages

• Easy installation: The hexagonal design makes the nut easy to tighten with tools (such as wrenches).
• Strong load-bearing capacity: Hexagonal nuts can provide strong fixing force by closely matching with the threads of bolts.
• Wide application: Suitable for various mechanical and building connections, especially in environments requiring large loads.

Square nut

Square nut is a fastener with four sides, and its shape is square compared to hexagonal nuts. It is usually used with bolts in industries such as machinery, construction, and automobiles. The design and structure of square nuts make them superior to hexagonal nuts in some special cases, especially in situations where a larger contact area is required. The shape of the square nut is square, and the inner hole has threads, which can match bolts of corresponding specifications. The four sides of the square nut are usually the same length, and its shape provides a larger contact surface than the hexagonal nut.

1. Function and use

Square nuts have more advantages than hexagonal nuts in some applications, mainly in the following aspects:
① Larger contact area: Square nuts provide a larger contact surface, which helps to disperse the load, especially when used on soft or thin-walled materials, and can effectively prevent material damage caused by excessive load.
② Suitable for special environments: For example, in some occasions that require strong support, square nuts can provide better stability.
③ Commonly used in woodworking and furniture manufacturing, large equipment and engineering machinery, railways and construction projects

2. Advantages

• Strong load-bearing capacity: The four sides of the square nut provide a large contact area, which can withstand large loads and reduce damage caused by excessive local pressure.
• Suitable for thin-walled or soft materials: Due to its large contact surface, square nuts can better disperse the load and reduce deformation or damage on thin-walled or soft materials.
• Good stability: Compared with hexagonal nuts, square nuts can provide better stability in environments that require greater support.

Butterfly nut

1. Structural features

The structural feature of the butterfly nut lies in its shape. It looks like a nut with “wings” extending from both sides, which allows the user to easily rotate the nut by hand without the help of tools. Its inner hole is threaded, which cooperates with the bolt to achieve tightening and connection.

2. Function and use
The main function of the butterfly nut is to achieve the tightening between the bolt and the nut, and it can be tightened and disassembled by manual rotation. Due to its special design, butterfly nuts are often used in furniture and household appliances, automobiles, bicycles, motorcycles, laboratory equipment and temporary facilities: in the installation of some laboratory equipment or temporary facilities, butterfly nuts can provide a convenient way to disassemble.

3. Advantages

• Easy installation and disassembly: The biggest advantage of butterfly nuts is that they can be operated manually without the use of any tools. This makes it particularly suitable for environments that require frequent disassembly and reinstallation.
• Save time and labor costs: Users can quickly complete installation or disassembly without the need for special tools, greatly saving time and labor costs.
• Suitable for emergency repairs: If the equipment fails and needs to be repaired quickly, the butterfly nut can be quickly disassembled and repaired without carrying tools.
• Small installation space: The butterfly nut does not require a large area of ​​operating space and is suitable for use in small environments.

Round nut

Round nut is a fastener with a circular shape, usually used in specific connection applications. Its main feature is that compared with traditional hexagonal nuts or square nuts, its appearance is round, and it is usually used in electrical equipment, pipelines, mechanical devices and other fields. Due to its shape and design, round nuts have unique advantages in certain applications.

1. Structural features

• Appearance: round, no sharp corners, simple appearance.
• Material: Common materials include carbon steel, stainless steel, aluminum alloy, brass, etc., and different materials are selected according to the use requirements.
• Thread specification: Metric or imperial threads can be selected as needed, suitable for bolts or screws of different standards.

2. Function and use

The main function of the round nut is to connect by cooperating with bolts or screws. It is usually used in environments that require a small contact area and low stress. Common application scenarios include:

• Electrical equipment: In electrical equipment, round nuts are often used to fix cable connectors, especially in situations where terminal blocks need to be tightened.
• Pipeline connection: In some pipeline systems, round nuts can be used to connect pipelines with equipment such as valves and pumps, especially in some compact spaces.
• Mechanical equipment: In some structures of mechanical equipment, round nuts can also be used as connecting elements, which are often found in places where tightening is required but traditional nuts are not easy to use.

3. Advantages

• Simple structure: The round nut has a simple appearance and does not have sharp corners like hexagonal nuts, avoiding possible injuries or damage to the surface of objects.
• Suitable for compact spaces: Due to its round appearance, round nuts can be used in places with limited space, especially in environments where hexagonal nuts cannot be used.
• Suitable for special applications: In some special environments (such as electrical, plumbing, etc.), round nuts are widely used due to their shape and functional requirements.

Pull rivet nut

Pull rivet nut is a fastener used on thin plates or structural parts that cannot be operated from the other side, also known as threaded pull rivet nut. It combines the advantages of riveting and threaded connection, has an efficient and simple installation method, can provide a stable threaded connection, and is widely used in automobiles, aviation, electronics, mechanical equipment, furniture and other fields.

1. Structural features

• Appearance: Pull rivet nuts are usually cylindrical or similar shapes, with one end open and the other end closed.
• Thread: The inner hole is threaded, usually metric thread (such as M6, M8, M10, etc.), used to fix with bolts and screws.
• Riveting part: One side of the pull rivet nut is designed to expand outward, which will deform during installation, so that the nut is firmly fixed in the installation hole to prevent it from falling off.

2. Function and Use

The main function of the rivet nut is to provide a threaded hole for fixing bolts for thin-walled workpieces that cannot be operated from the other side. It is widely used in the following fields:

• Automobile manufacturing: In the body, engine parts and interior, rivet nuts are often used to fix bolts, especially in the connection of thin body panels and hollow parts.
• Aerospace: Rivet nuts are used in the structural parts of aircraft, satellites and other aerospace vehicles to provide stable connection force.
• Furniture manufacturing: In the assembly of furniture and home appliances, rivet nuts can be used to fix bolts for easy disassembly and installation.
• Electronic equipment: In some electronic housings or casings, rivet nuts can be used to fix screws, especially those parts with limited space.
• Industrial machinery: Suitable for assembly and fixing of various mechanical equipment, especially in occasions where it cannot be operated from the other side.

3. Advantages

• No need for back operation: Unlike traditional nuts, rivet nuts do not need to be operated through the other side of the workpiece during installation, which is suitable for situations where the back cannot be accessed.
• Quick installation: The process of installing rivet nuts is very simple and quick, which can significantly improve production efficiency, especially when batch installation is required.
• Strong and reliable: Because the installation process of the rivet nut causes it to expand and fix, it can provide strong tensile and shear resistance to ensure a stable connection.
• Suitable for thin plates and soft materials: Rivet nuts are particularly suitable for soft materials such as thin plates, plastics and aluminum alloys because they can provide a stable threaded connection without the need for a fixing nut on the back.

T-nut

T-nut is a fastener with a “T”-shaped structure used in industries such as woodworking and metalworking. Its design makes it very suitable for connections that need to be installed from one side, especially in the connection of wood and other soft materials. T-nuts are usually used to provide a secure threaded connection for bolts or screws, especially in situations where the back of the workpiece cannot be accessed during installation.

1. Structural features

The structure of the T-nut consists of two parts:

• “T”-shaped part: Its upper end is in a “T” shape, designed to protrude on both sides, used for installation on wood or metal surfaces, and can provide a fixing point inside the material.
• Bottom plate part: The bottom is usually flat or has a certain convexity, the purpose is to ensure that it can be tightly fixed to the surface of the installed material to prevent loosening when stressed.

2. Function and use

The main function of the T-nut is to provide a secure threaded connection for bolts or screws, especially for woodworking applications, machinery and equipment assembly, furniture manufacturing, 3D printing and robotics.

3. Advantages

• Convenient installation: The installation process of T-nut is simple, and the nut can be quickly embedded into the workpiece, saving installation time.
• Efficient fastening connection: It can provide a firm threaded connection, ensure a stable connection, and is suitable for high-intensity use environments.
• Wide range of application: It is suitable for various materials (such as wood, aluminum alloy, steel, etc.), especially for thin plates, soft materials and occasions that cannot be operated from the back.
• Space saving: T-nut does not require extra space on the back of the connector and can provide an effective connection in a limited space.

Weld nut

Weld nut is a nut fixed to the workpiece by welding. It is often used in parts that need to be connected by threading, especially in places where it is not convenient to operate from the back or where traditional nuts cannot be used. The design of the weld nut enables it to be firmly connected to the metal surface and provide a reliable threaded connection point. It is widely used in many industries such as automobiles, home appliances, machinery manufacturing, and electronic equipment.

Weld nuts are divided into four-corner weld nuts and hexagonal weld nuts

• Four-corner weld nut

The four-corner weld nut is a weld nut with a square shape, which is specially designed to be fixed to the surface of the workpiece by welding. Unlike traditional round weld nuts, the four-corner weld nut has a square shape and is usually used for high-strength and stable threaded connections. It is particularly suitable for thin plates and workpieces that are difficult to operate from the other side. Due to its four-corner shape, the contact area of ​​the weld can be increased and the bonding strength with the workpiece can be enhanced.

• Hexagonal weld nut

The hexagonal weld nut is a weld nut with a hexagonal shape, which is usually used in places where it needs to be fixed to the surface of the workpiece by welding. Its design is similar to that of traditional hexagonal nuts, but its bottom or certain parts are specially treated to facilitate welding. The internal thread part of this welding nut is used to connect with bolts and screws, and its hexagonal shape design makes it easy to weld and provides reliable fastening force when used.

Flange nut

A flange nut is a nut with a flange. The design of the flange nut enables it to provide better support and contact surface, thereby increasing the stability and load-bearing capacity of the nut. The flange part is usually used to disperse the load, reduce the indentation on the surface of the connected parts, and enhance the tightening force, especially on softer or thinner materials.

1. Working principle of flange nut

The working principle of flange nut is similar to other nuts. It is mainly connected with bolts and screws through its internal threads to fix the object when tightening. But its uniqueness lies in the flange design at the bottom. The flange part can:

• Increase contact area: The flange part makes the force-bearing surface of the nut larger, reducing the indentation or depression on the contact surface between the nut and the workpiece, especially on softer or thinner materials.
• Disperse load: The flange can effectively disperse the pressure applied by the bolt and prevent damage caused by concentrated stress.
  Improve stability: The flange part enhances the stability of the nut and prevents the nut from loosening under vibration or impact.

2. Applications of flange nuts

Flange nuts are suitable for a variety of applications that require additional support and increased contact area. They are commonly used in the automotive industry, mechanical equipment, construction and structural engineering, electronics and home appliances.

3. Advantages of flange nuts

Enhanced support: The flange part can provide a larger contact area, disperse the pressure, and reduce damage to the workpiece surface, especially on softer materials.

• Anti-loosening: Flange nuts with teeth or locking design can effectively prevent loosening caused by vibration and impact, and increase the stability of the nut.
• Improve connection stability: Due to the support of the flange, the connection provided by the flange nut is more stable than that of ordinary nuts, suitable for high-load and dynamic applications.
• Reduce indentation and wear: The extended bottom surface of the flange nut can evenly disperse the applied pressure and reduce the damage caused by pressure on the connection surface, which is especially useful on thin plates or soft materials.
• Convenient installation: The flange part of the flange nut provides a support surface for the workpiece, avoiding the nut from directly contacting the workpiece during installation, simplifying the assembly process.