Ordinary outer hexagon nut: widely used, characterized by relatively large tightening force, the disadvantage is that there should be enough operating space in the installation, installation can use flexible wrench, open wrench or glasses wrench, the above wrench requires a lot of operating space.
Cylindrical head inner hexagon: is the most widely used in all screw, because its tightening force is relatively large, the use of inner hexagonal wrench can be operated, installation is very convenient, almost used in a variety of structures, the appearance is more beautiful and neat, the shortcoming is that the tightening force is slightly lower than the outer hexagonal, in addition, repeated use is easy to damage the inner hexagonal caused by impossibility. Disassemble.
Hexagons in the tray head: seldom used in machinery, mechanical properties are the same, mostly used in furniture, the main role is to increase the contact surface with wood materials and increase the appearance of the ornamental.
Headless inner hexagons: Certain structures must be used, such as top wire structures requiring large tightening force, or places where cylindrical heads need to be hidden.
Hexagons in countersunk heads: They are mostly used in power machinery, and their main functions are the same as those of hexagons in countersunk heads.
Nylon lock nut: Insert nylon rubber ring in hexagonal surface to prevent loosening of thread structure and use in strong power machinery.
Flange nuts: mainly play the role of increasing the contact surface with the workpiece, mostly used in pipelines, fasteners have been some stamping and casting parts.
Ordinary outer hexagon nut is the most widely used fastener, and it is also one of the most common fasteners.
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