The main purpose of the plug
Screw plugs, in fact, have many names. For example, it can be called a screw plug, such as an external hexagon screw. Also called hex bolts. It all means the same thing. It's just a matter of personal habits. Ordinary bolts are divided into three types: A, B, and C. The first two are refined screws and are rarely used. Generally speaking, ordinary screws refer to C-class ordinary screws.
The screw plug is a mating nut, which is used to fasten and connect two connected parts with through holes. Plugs are commonly used bolts. There are many outer hexagons of class A and class B, which are more important. And it is widely used in occasions with high requirements on assembly accuracy and large impact, vibration or span rate loads. Grade C external six or six screws are used for occasions with rough surface and low assembly accuracy.
The thread on the external thread plug is generally fine-toothed ordinary thread, and the external thread plug with wound teeth has good self-sale performance, and is mainly used on thin-walled parts or under the condition of shock, vibration or alternating load. External thread plugs generally use partial threads, and full thread external thread plugs are mainly used for external hexagonal warp yarns with short nominal lengths and occasions requiring long threads. Plugs with external holes are used where external plug locking is required. External screw plugs with hinge holes allow precise positioning of the phase to the connecting components. And can withstand shear and extrusion caused by die directional force.
