There are various types of bolts, which can be classified according to different classification standards. The following are the main types of bolts:
Classify according to the connection method. Ordinary bolts and bolts with hinged holes are used for general connections, while bolts with hinged holes are used for precise fitting with components with corresponding holes.
Classify according to the shape of the head. Hexagonal head bolts, square head bolts, round head bolts, countersunk bolts, T-groove bolts, U-bolts, etc. These bolts have different head designs and are suitable for different installation and fixing needs.
Classify according to thread shape and type. Ordinary threaded bolts, straight thread bolts, tapered thread bolts, high-strength bolts, stainless steel bolts, copper bolts, aluminum bolts, etc. Different types of threads are suitable for different working environments and load requirements.
Classify according to special functions. For example, anti loosening bolts, slip ring bolts, tension control bolts, etc., these bolts with special functions are used in specific application scenarios.
Classify according to materials. Steel bolts, stainless steel bolts, copper bolts, aluminum bolts, etc., bolts made of different materials are suitable for different environments and usage conditions.
Classify according to performance level. Ordinary bolts (grade A, B, C) and high-strength bolts (grade 8.8 or above) have different bearing capacity and accuracy depending on their performance levels.
Special types of bolts. Such as anchor bolts (expansion type anchor bolts, expansion type anchor bolts, bonding type anchor bolts, etc.), which are usually used to fix components on concrete or other substrates.
Each type of bolt has its specific application scenarios and advantages, and selecting the appropriate bolt is crucial for ensuring the safety and efficiency of the structure.
Bolt inspection is divided into two types: manual and machine. Artificial is the most primitive and widely used method of consistent detection. In order to minimize the outflow of defective products, production enterprise personnel generally inspect the packaged or shipped products visually to eliminate defective products (including tooth damage, mixing, rust, etc.).
Another method is fully automatic machine inspection, mainly magnetic particle testing. Magnetic particle testing utilizes the interaction between the leakage magnetic field at bolt defects and magnetic particles. In response to the difference in magnetic permeability between possible defects (such as cracks, slag inclusions, and mixed materials) and steel magnetic permeability, the magnetic field at discontinuous areas of these materials will undergo distortion after magnetization, forming a leakage magnetic field on the surface of the workpiece at some magnetic flux leakage points, thereby attracting magnetic particles to form a magnetic particle accumulation at the defect site – magnetic marks. Under appropriate lighting conditions, the defect location and shape are displayed, and the accumulation of these magnetic particles is observed and explained to achieve the purpose of removing defective products.
Post time: Apr-11-2024