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Tower Machine High Strength Bolt Series

Mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of head and screw (cylinder with external thread), which needs to be matched with nut to fasten and connect two parts with through-hole. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is detachable.

subclassification：

Tower Crane Series

Key words：

Tower Machine High Strength Bolt Series

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Product details

According to the stress mode of connection, it can be divided into ordinary ones and those with reaming holes. According to the shape of the head, it is divided into hexagonal head, round head, square head, countersunk head, etc. Hexagonal head is the most commonly used. Generally, countersunk head is used where connection is required. The horseback bolt, whose English name is U-bolt, is a non-standard part and its shape is U-shaped, so it is also called U-bolt. The two ends have threads that can be combined with nuts. It is mainly used to fix tubular objects such as water pipes or sheet objects such as the leaf springs of cars. Because its way of fixing objects is like people riding on horses, it is called horseback bolt. According to the length of thread, it is divided into full thread and non-full thread. According to the tooth shape of the thread, it is divided into coarse tooth and fine tooth, and the coarse tooth shape is not shown in the sign of the bolt. Bolts are divided into eight grades according to their performance grades: 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. Bolts above grade 8.8 (including grade 8.8) are made of low carbon alloy steel or medium carbon steel and heat treated (quenched+tempered), which are generally referred to as high-strength bolts, and bolts below grade 8.8 (excluding grade 8.8) are generally referred to as ordinary bolts. [2] Ordinary bolts can be divided into three grades according to the manufacturing accuracy: grade A, B and C. Grade A and B are refined bolts, and grade C is rough bolts. Unless otherwise specified, the connecting bolts for steel structures are generally ordinary rough grade C bolts. There are differences in the processing methods of different levels. Generally, the corresponding processing methods are as follows: ① The bolt rod of grade A and B bolts is processed by lathe, with smooth surface and accurate size, and its material performance grade is 8.8. The manufacturing and installation are complex, and the price is high, so it is rarely used; ② Grade C bolts are made of unprocessed round steel, the size is not accurate enough, and the material performance grade is 4.6 or 4.8. The shear connection has large deformation, but it is easy to install and has low production cost. It is mainly used for tensile connection or temporary fixation during installation.

Tower Machine High Strength Bolt Series