Plain Washer for Self-tapping Screw Assemblies

The plain washer for self-tapping screw assemblies is a kind of washer used in conjunction with self-tapping screws. The following is a detailed introduction to the plain washer for self-tapping screw assemblies:

Relevant Standards of the Plain Washer for Self-tapping Screw Assemblies

GB/T 97.5-2002: It specifies the plain washers applicable to the self-tapping screw and plain washer assemblies (in compliance with GB/T 9074.18), with a nominal specification (major diameter of the thread) of 2.2 - 9.5mm, belonging to the standard series and large series, with a hardness grade of 180HV and a product grade of Class A.

GB/T 9074.29-1988: It specifies the plain washers for self-tapping screw assemblies, applicable to the plain washers with a nominal specification (major diameter of the thread) of 1.6 - 64mm, belonging to the standard series, with hardness grades of 200HV and 300HV, and a product grade of Class A.

Structural Features of the Plain Washer for Self-tapping Screw Assemblies

Shape: Usually, it is a circular thin piece with a hole in the middle for the self-tapping screw to pass through, and it is flat as a whole.

Dimensions: The dimensional specifications match the self-tapping screws they are used with, including parameters such as the inner diameter, outer diameter, and thickness. For example, according to GB/T 9074.29-1988, the nominal diameters have different specifications such as 2.9, 3.5, and 4.2, and there are corresponding regulations for their inner diameters, outer diameters, and thicknesses.

Materials: Generally, it is made of metal materials, such as carbon steel, stainless steel, etc. The plain washer made of carbon steel has a certain strength and toughness and can meet general usage requirements; the plain washer made of stainless steel has good corrosion resistance and is suitable for harsh environments such as wet conditions and environments with corrosive media.

Working Principle of the Plain Washer for Self-tapping Screw Assemblies

In the self-tapping screw assemblies, the plain washer mainly plays the following roles:

Dispersing Pressure: When the self-tapping screw is screwed into the connected component, the plain washer increases the contact area between the screw head and the connected component, making the pressure exerted by the screw on the connected component more evenly distributed, and avoiding damage to the surface of the connected component caused by excessive local pressure.

Increasing Sealing Performance: The plain washer can fill the tiny gaps between the screw head and the connected component, playing a certain sealing role to prevent liquids, gases, or dust from entering or leaking from the connection part.

Protecting the Surface: It prevents the head of the self-tapping screw from directly rubbing against the surface of the connected component during the tightening process, thus protecting the surface of the connected component from being scratched or worn.

Advantages of the Plain Washer for Self-tapping Screw Assemblies

Strong Versatility: It can be used in combination with self-tapping screws of various specifications and is suitable for different connection requirements.

Convenient Installation: Just put the plain washer on the self-tapping screw and then screw them together into the connected component. There is no need for additional complex installation tools or operations.

Low Cost: With a simple structure, a mature manufacturing process, and a relatively low material cost, it can effectively control the cost while ensuring the connection performance.

Application Fields of the Plain Washer for Self-tapping Screw Assemblies

Mechanical Manufacturing: It is used for the assembly of the casings of mechanical equipment, the connection of components, etc., such as in machine tools, motors, and other equipment, which can make the connection more secure and flat.

Electronic Equipment: In the production of electronic equipment, such as computers, mobile phones, etc., it is used to fix components such as circuit boards and casings, which can not only ensure the reliability of the connection but also protect the electronic components and the surface of the equipment.

Furniture Manufacturing: During the assembly of furniture, it is often used to connect wooden boards, metal components, etc., making the structure of the furniture more stable and avoiding damage to the wood surface caused by the screws.

Construction and Decoration: In the field of construction and decoration, it can be used to fix doors and windows, decorative panels, electrical conduits, etc., improving the stability and aesthetic appeal of the connection.

Precautions for Selecting the Plain Washer for Self-tapping Screw Assemblies

Size Matching: According to the specifications of the self-tapping screws, accurately select the plain washers of corresponding sizes to ensure that the inner diameter of the washer is suitable for the screw diameter, and the outer diameter can meet the requirements for dispersing pressure and sealing.

Material Selection: Determine the material of the plain washer according to the usage environment. For example, in a wet environment or outdoors, stainless steel materials should be selected; in a general dry environment, the plain washer made of carbon steel can usually meet the requirements.

Hardness Requirements: The hardness of the plain washer should match the hardness of the self-tapping screw and the connected component. If the washer is too hard, it may damage the surface of the connected component; if it is too soft, the washer is likely to deform when the screw is tightened, affecting the usage effect.