High-strength bolts|Steel structural bolts|Twisted shear bolts, 10.9S bolt analysis

September 27, 2022

High-strength bolts are mostly used for the connection of bridges, rails, high-pressure and ultra-high-pressure equipment. The breakage of such bolts is mostly brittle fracture. High-strength bolts used in ultra-high-pressure equipment need to be applied to ensure the sealing of the container.
12 9 Grade Hex Bolt 4

Several concepts about high-strength bolts 1. According to the specified performance level of bolts above 8.8, it is called high-strength bolts. The current national standard is only listed to M39. For large-size specifications, especially the length is more than 10~15 times. The high-strength bolts are still short-lived in domestic production.
Kunshan Zhonggu Precision Hardware Co., Ltd.
Bolt classification
1. According to the way of connection, there are common and reamed holes. The bolts for reaming holes should match the size of the holes and be used when subjected to lateral forces.
2, according to the shape of the head, there are hexagonal heads, round heads, square heads, countersunk heads, etc. The general countersunk head is used in places where the surface is required to be smooth and not protruding, because the countersunk head can be screwed into the part. The head can also be screwed into the part. The tightening force of the square head can be larger, but the size is very large. Hex head is the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head, and the rod has holes, which can make the bolt not loose when it is vibrated.
Some bolts with unthreaded rods are to be thin, called thin waist bolts. These bolts are beneficial for the coupling of variable forces.
There are special high-strength bolts on the steel structure. The head will be bigger and the size will change.
In addition, there are special uses: T-slot bolts, the most used on machine tool fixtures, special shape, cut off on both sides of the head. Anchor bolts for machine and ground connection, there are many shapes. U shape Bolts, as mentioned above.
There is also a special stud for welding. There is no thread at one end, it can be welded on the part, and the nut can be directly screwed on the other side.
The latest analysis of bolt basics:
Bolts, mechanical parts, cylindrical threaded fasteners with nuts.

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