Classification of bolts


According to the way of the connection of the force: po […]

According to the way of the connection of the force: points for ordinary and hinged holes. According to the shape of the head: Hexagonal head, round head, square head, countersunk head and so on. The hexagon head is the most commonly used. General counters are used where connection is required.
Horse bolt English name is U-bolt,Non-Standard Bolts is a non-standard parts, the shape of U-shaped so it is also called U-bolt, two threads can be combined with the nut, mainly used to fix the tube such as water pipes or sheets such as car plate The spring is called a horse-riding bolt because it fixes the object in the same way as a person rides on a horse. According to the thread length is divided into two types of full thread and non-full thread.

There are two kinds of coarse teeth and fine teeth according to the thread profile, and the coarse teeth are not displayed in the bolt marks. The bolts are divided into 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9, and 12.9 grades according to the performance grade. Among them, bolts of grade 8.8 or higher (including grade 8.8) are made of low carbon alloy steel or medium carbon steel and heat-treated (quenched) + Tempering), commonly known as high-strength bolts, grade 8.8 (excluding 8.8) commonly known as ordinary bolts.

Ordinary bolts can be categorized into three grades: A, B, and C according to the manufacturing accuracy. A and B grades are refined bolts, and C grades are coarse bolts. For steel structural bolts, unless otherwise specified, the general crude C-class bolts. There are differences in the methods of different grades of processing, usually the corresponding processing methods are as follows: 1A, B bolt bolts by the lathe processing, the surface is smooth, precise size, its material performance rating is 8.8, production and installation complex, the price is High, rarely used; 2C bolts are made from unprocessed round steel, not precisely sized, and have a material performance rating of 4.6 or 4.8. Large deformation during shear connection, but easy installation, low production cost, mostly used for tensile connection or temporary fixing during installation.