Hex Bolt is divided into two types: Hex Bolt and Hex Bolt.
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 and round heads. , Square head, countersunk head, etc. Generally, the countersunk head is used where the surface after the connection is required to be smooth without protrusions, because the countersunk head can be screwed into the part. The round head can also be screwed into the part. The tightening force of the square head can be Larger, but larger in size. Hexagonal head is the most commonly used.
In addition, in order to meet the need of locking after installation, there are holes on the head and holes on the rod. These holes can prevent the bolt from loosening when it is vibrated.
Hexagon socket screws are often used in machinery, and they mainly have the advantages of easy fastening and disassembly, and not easy to slip corners. Allen wrenches generally have a 90° turn. The bent end is long and the other is short. When the short end is used to screw the screw, the long end can save a lot of force and can better tighten the screw.
The long end has a round head (a hexagonal cylinder is similar to a sphere) and a flat head. The round head can be easily slanted in and removed to install some parts that are not convenient for the wrench. The manufacturing cost of the outer hexagon is much lower than that of the inner hexagon. Its advantage is that the screw head (the position where the wrench is stressed) is thinner than the inner hexagon, and in some places it cannot be replaced by the inner hexagon. In addition, machines with low cost, low power strength and low precision requirements use fewer hexagon socket screws than external hexagon screws.
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