Countersunk Head Blind Rivet Nut

The countersunk head blind rivet nut is a kind of fastener widely used in mechanical connection and assembly. The following is a detailed introduction to the countersunk head blind rivet nut:

Definition and Structure of the Countersunk Head Blind Rivet Nut

The countersunk head blind rivet nut is a tubular nut with internal threads. One end of it is in the shape of a countersunk head, and the other end has a flange or a bell mouth for riveting. The countersunk head part is conical or approximately conical, which can be flush with or slightly lower than the installation surface, making the connection smoother and more beautiful. There are usually various forms of grooves or teeth on the cylinder to increase the friction force and anti-loosening performance after riveting. The internal threads are used to cooperate with bolts or screws to achieve the connection between components.

Features of the Countersunk Head Blind Rivet Nut

High Connection Strength: Connected to the thin plate by riveting, it can provide reliable fastening force, effectively prevent the nut from loosening or falling off, and can bear large tensile force and shear force. It is suitable for connection parts that need to bear a certain load.

Smooth and Beautiful Appearance: The countersunk head design makes it flush with the connection surface after installation, and the overall appearance is neat and smooth. It is especially suitable for occasions with high requirements for appearance, such as furniture, electronic device casings, etc.

Convenient Installation: Just use simple riveting tools to rivet the blind rivet nut onto the thin plate. There is no need to carry out complex thread processing on the thin plate. The installation process is simple and efficient, which can effectively improve work efficiency.

Manufacturing Standards of the Countersunk Head Blind Rivet Nut

Common national standards include GB/T 17880.2 - 1999 "Countersunk Head Blind Rivet Nuts". This standard has made detailed regulations on the dimensions, tolerances, materials, mechanical properties, and surface treatments of the countersunk head blind rivet nuts. For example, it clarifies the dimensional parameters such as the outer diameter, inner diameter, height, and countersunk head angle of blind rivet nuts of different specifications, as well as the mechanical property requirements such as the tensile strength and hardness of the materials.

Materials and Surface Treatments of the Countersunk Head Blind Rivet Nut

Commonly Used Materials: Generally, materials such as low-carbon steel, stainless steel, and aluminum alloy are used. The countersunk head blind rivet nuts made of low-carbon steel have high strength and toughness and relatively low cost; those made of stainless steel have good corrosion resistance and are suitable for humid environments or environments with corrosive media; the blind rivet nuts made of aluminum alloy are light in weight and are often used in occasions with requirements for weight, such as in the aerospace, electronic device, and other fields.

Surface Treatments: In order to improve the corrosion resistance and wear resistance of the countersunk head blind rivet nuts, surface treatments are usually carried out. Common treatment methods include galvanizing, nickel plating, chrome plating, etc., which can form a protective film on the surface of the nut to prevent oxidation and corrosion. In addition, according to special requirements, blackening treatment, phosphating treatment, etc. may also be adopted.

Application Fields of the Countersunk Head Blind Rivet Nut

Electronic Device Manufacturing: It is widely used in the assembly of the casings of electronic devices such as mobile phones, tablets, and laptops. It can achieve a reliable connection between the thin and light casings and the internal structural parts, while ensuring a smooth and beautiful appearance, meeting the requirements of electronic devices for appearance and thinness.

Automobile Manufacturing: It is used for the connection of thin plates in parts such as automobile bodies and interior parts, such as the connection of automobile door panels, engine hoods, etc. It can not only ensure the connection strength but also make the appearance more flat, improving the overall quality of the automobile.

Furniture Manufacturing: In the assembly of furniture, especially in some panel furniture and high-end furniture, the countersunk head blind rivet nuts are often used to connect thin plate components, such as cabinet doors, drawers, etc., making the surface of the furniture flat and smooth without protruding nuts, and improving the aesthetic degree and overall texture of the furniture.

Architectural Decoration: It can be used for the installation of building curtain walls, ceilings, decorative panels, etc., fixing the thin plate materials to the frame or base, providing a firm connection, and maintaining a good decorative effect at the same time, making the appearance of the building more beautiful and generous.

Marking Method of the Countersunk Head Blind Rivet Nut

The marking content includes information such as the product name, nominal diameter, nominal length, material, and surface treatment. For example, the marking "Blind Rivet Nut GB/T 17880.2 M8×12 - 10B Zn" indicates a countersunk head blind rivet nut with a nominal diameter of 8mm, a nominal length of 12mm, a material of 10B steel, and a surface treatment of galvanizing.

Purchase Precautions for the Countersunk Head Blind Rivet Nut

Size Matching: According to the actual thickness of the thin plate used and the connection requirements, precisely select a countersunk head blind rivet nut of an appropriate specification to ensure that its outer diameter, inner diameter, length, and countersunk head size match the installation part to ensure the riveting effect and connection strength.

Material Selection: Select a blind rivet nut of an appropriate material according to the usage environment and working conditions. For example, in a humid or corrosive environment, a stainless steel blind rivet nut or a blind rivet nut with special anti-corrosion treatment should be selected; for parts that bear a large load, the strength and toughness of the material need to be considered.

Quality Inspection: When purchasing, carefully check the appearance quality of the blind rivet nut, which should have no defects such as cracks, burrs, and deformations. At the same time, pay attention to checking the accuracy and smoothness of its threads to ensure good cooperation with bolts or screws and guarantee the reliability of the connection.

Installation and Maintenance of the Countersunk Head Blind Rivet Nut

Installation: When installing the countersunk head blind rivet nut, first process a suitable installation hole on the thin plate, then put the blind rivet nut into the hole, and use special riveting tools (such as pneumatic rivet guns, hydraulic riveting machines, etc.) to rivet the blind rivet nut. During the riveting process, control the pressure and stroke of the riveting tool well to make the flange or bell mouth of the blind rivet nut fully deformed and closely combined with the thin plate, and at the same time, ensure that the countersunk head part is flush with or slightly lower than the installation surface.

Maintenance: Regularly check the connection condition of the blind rivet nut to see if there are problems such as looseness, deformation, or corrosion. If the blind rivet nut is found to be damaged or the connection is not firm, it should be replaced in a timely manner. When repairing or maintaining the equipment or product, also pay attention to checking and maintaining the blind rivet nut to ensure the reliability of the entire connection system.