Hello everyone, in daily life, the most common fasteners are hexagonal bolts, expansion screws, and drill tails. Today, Guo’s screw diary will briefly tell you about hexagonal bolts. Hex bolts actually refer to fasteners consisting of a head and a screw. Bolts are mainly divided into iron bolts and stainless steel bolts according to their materials. Iron is divided by grade, the common ones are 4.8, 8.8, and 12.9. According to the material of stainless steel, there are stainless steel SUS201, SUS304, SUS316 bolts.
A complete set of hex bolts consists of a bolt head, a nut and a flat washer
Hexagon head bolts are hexagon head bolts (partial thread)-c hexagon head bolts (full thread)-c level, also known as hexagon head bolts (coarse) hexagon head bolts, black iron screws. Commonly used standards are mainly: sh3404, hg20613, hg20634, etc.
Hexagonal head bolts (referred to as hexagonal bolts) are composed of a head and a threaded rod ( There are more than 10 grades of material performance comprehensive grades of bolts used for steel structure connection, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., among which 8.8 grade and above through bolts and materials are low carbon alloy steel or medium Carbon steel and relevant heat treatment (quenching, tempering) are commonly called high-strength bolts, and the rest are commonly called ordinary bolts. The bolt performance grade mark consists of two parts of numbers, which respectively represent the nominal tensile strength value and yield ratio of the bolt material. The following are examples. The meaning of bolts with performance grade 4.6 is: 1. The nominal tensile strength of the bolt material reaches 400mpa; 2. The yield strength ratio of the bolt material is 0.6; 3. The nominal yield strength of the bolt material reaches 400×0.6=240MPa level For high-strength bolts of performance level 10.9, the material after heat treatment reaches: 1. The nominal tensile strength of the bolt material reaches 1000MPa; 2. The yield strength ratio of the bolt material is 0.9; 3. The nominal yield strength of the bolt material reaches 1000×0.9=900MPa level The meaning of different grades of bolt performance is an international standard. Bolts with the same product performance evaluation grade have the same performance regardless of the difference in their materials and origins. Only the safety performance index grade is selected for design. The above is the relevant knowledge about hexagonal bolts, I hope you can have a reference when choosing hexagonal bolts
Post time:
Mar-15-2023