Heavy hex bolts are a type of fastener consisting of two parts: head and screw (cylinder with external thread), which need to be matched with a nut to fasten and connect two parts with through holes. 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 a detachable connection.
Classification of heavy hex bolts: 1. According to the force mode of the connection, there are ordinary and reamed holes. The bolts used for reaming holes should be matched with the size of the hole and used when subjected to lateral force.
- According to the shape of the head, there are hexagonal heads, round heads, square heads, countersunk heads, etc.Generally, countersunk heads are used where the surface is required to be smooth without protrusions after the connection, 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 large. The hexagon head is the most commonly used.
The performance grades of bolts for steel structure connection are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9.
The production process of heavy hexagon bolts: hot rolled wire rod-(cold drawing)-spheroidizing (softening) annealing-mechanical dephosphorization-pickling-cold drawing-cold forging forming-thread processing-heat treatment-inspection
Ningbo Zhenhai Yongding Fastener Manufacturing Co., Ltd. is a manufacturer of heavy hex bolts. The production process is rigorous and high-quality, which is a good choice.
