Bi-Metal Screws Overview

Structural Composition:

Bi-metal screws are usually composed of two different metal materials. It is common to use metals such as carbon steel that provide strength and hardness as the main part of the screw. On the surface or key parts of the screw, such as the drill tip and head, it is combined with metals with special properties such as stainless steel, copper, and zinc.

For example, the drill tip of some bi-metal screws is made of heat-treated high-carbon steel to enhance drilling performance, while the main body and head of the screw are made of corrosion-resistant 304 or 316 stainless steel, which can ensure good drilling ability and excellent corrosion resistance.

Application

1. Construction industry: In construction, it is widely used for the installation and fixation of steel structures, color steel plates, roof panels, etc. For example, when the color steel plate is fixed on the light steel keel, the self-drilling and self-tapping performance of bi-metal screws can quickly complete the installation, and its corrosion resistance can ensure the reliability of the connection in long-term use.
2. Manufacturing industry: Commonly used in the assembly of mechanical equipment, the connection of the body and engine in automobile manufacturing, etc. On the automobile production line, bi-metal screws can firmly connect parts of different materials together, such as connecting plastic panels to metal body frames. Its good comprehensive performance can adapt to complex working conditions and frequent vibrations.
3. Electronic and electrical industry: In electronic equipment, it can be used for the installation of circuit boards and the grounding connection of various electrical equipment. Due to its good conductivity and corrosion resistance, it can ensure reliable electrical connection between electronic components and prevent electrical failures caused by screw corrosion.

Feature

Performance characteristics:

• Good corrosion resistance: The outer layer of stainless steel, zinc and other metal materials can effectively prevent the screws from rusting and corrosion in various harsh environments, such as humid, acidic and alkaline corrosive environments, greatly extending the service life. For example, in outdoor building structures, bi-metal screws can maintain good performance even if they are exposed to wind and rain for a long time.
• Excellent mechanical properties: The internal carbon steel and other basic metal materials ensure that the screws have sufficient strength and toughness, can withstand large tensile and shear forces, and ensure the tightening effect. At the same time, the combination of different metals can also improve the wear resistance of screws to a certain extent, and reduce the damage to the screws themselves and the fastened parts during installation and removal.
• Special electrical properties: When the outer metal is a material with good conductivity such as copper, bi-metal screws can be used to connect electrical equipment, which can ensure the stable passage of current, achieve good electrical conductivity, and ensure the normal operation of electrical equipment.