Hexagonal flange bolts are a type of fastener composed of a hexagonal head, a flange plate (the gasket below the hexagon is fixed together with the hexagon), and a screw (a cylindrical body with external threads). They need to be matched with nuts and used to tighten and connect two parts with through holes.
Its performance level can be divided into multiple levels, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, bolts of grade 8.8 and above are usually made of low-carbon alloy steel or medium carbon steel, and have undergone heat treatment (quenching, tempering), commonly referred to as high-strength bolts, while the rest are commonly referred to as ordinary bolts. The bolt performance grade designation consists of two parts of numbers, representing the nominal tensile strength value and yield strength ratio of the bolt material, respectively.
Hexagonal flange bolts have some advantages, such as a larger ratio of support area to stress area compared to ordinary bolts, the ability to withstand higher pre tightening forces, and better relaxation performance. Its head is small and has holes or grooves, which can lock it more firmly when subjected to slight deformation. According to usage requirements, flanges can be divided into flat bottomed and toothed ones, with toothed ones providing anti slip function.
In practical applications, the specific requirements for hexagonal flange bolts vary depending on different usage locations and requirements. For example, in some environments that require rust prevention, bolts with surface treatments such as white, military green, colored yellow, or Dacromet may be used; The size requirements of the flange may vary depending on the location of use.
Post time: Jul-05-2024