Liaocheng Golden King Industrial Co.,Limited

There are many classifications of hex bolts. Some are internal hex and some are external hex. It is a commonly used fastener. What is the size and representation of hex bolts?

1. What is the specification, model and representation method of hexagonal bolts

If the hexagonal bolt is in accordance with the national standard, its specifications can be large or small, for example, the small ones are M3, M4, M6, etc., and the large ones can reach M64. At the same time, it is divided into grade A and grade B hexagon bolts. If it is grade A, it is used for D smaller than 24 mm. In addition, it can be divided into C-level, where A-level is the most accurate, and C-level is the worst. And different precisions and different grades represent different uses. Because the load-carrying capacity of Class A is slightly larger, be sure to check its label when purchasing.

Second, the classification of hexagonal bolts1. If it is divided according to the force mode of the connection, some are ordinary, and some are reamed holes, which should match the size of the holes. If divided according to the shape of the head, some are hexagonal, some are round or square, and the other is countersunk, and the surface is required to be smooth and free of unevenness, so as to ensure that the parts are screwed. among. Among them, the hexagonal head is the most commonly used type. Some have holes on the head and some have holes on the stem.

2. Some bolts do not have threads. These are called thin waist bolts, and some are used for special purposes, such as T-shaped bolts, which are used in machine tools. Both sides of the head must be cut off, and some are bolts with a U-shaped structure.

Third, the performance level of hexagonal boltsIf divided according to the bolt performance level, there are a total of more than 10, of which there are 3.6, 4.6, 8.8 or more, and some are low-carbon alloy steel or medium-carbon steel, which are called high-strength. The rest are called ordinary types, mainly because their tensile strength and yield ratio are different. If it reaches the 4.6 level, its tensile strength has already exceeded 400MPA.