Machine meter screw also known as set screw, stop screw, jacking wire.
The cross groove of the plum groove in the machine meter screw, the word groove, is also the slotted machine meter screw.
SCM435 alloy steel was used, the teeth were formed by cold upsetting, and then the surface was blackened.
Blackening is a common means of chemical surface treatment, the principle is to make the metal surface produce a layer of oxide film, in order to isolate the air, to achieve the purpose of rust.
