A socket wrench classification:
(1) According to the size (referring to the size of the square head): 1/4″, 3/8″, 1/2″ three specifications, 〃 means inches, 1″ is equal to 25.4MM (2) According to the length: long sleeve Barrel, Short Sleeve, E Sleeve
(3) According to the edge: 6 corners, 12 corners, 4 corners; (4) Appearance: single groove and double groove; knurling; The socket wrench (black, chrome molybdenum steel) is divided into (6) according to the different screws for disassembly: outer hexagon socket, outer torx socket; inner hexagon socket, inner hexagon socket, inner 12 socket socket; E-type sleeve Cylinder, pentagonal pressure supporting cylinder, pentagonal hollow pressure supporting cylinder, square sleeve, etc.
Two surface treatment
(1) Bright chrome: like a mirror, very bright (2) sub-chromium: matt (3) electrophoresis: black, with brightness. Under the action of an external DC power supply, the charged particles move directionally to the cathode or anode in the dispersed medium to promote the separation of substances; (4) Phosphating: black, but dull. The sleeve is immersed in the phosphating solution, and a layer of water-insoluble crystalline phosphorus is deposited on the surface, that is, the conversion process of phosphate.
Three production process
Rough (there are various specifications)--grinding (remove burrs, etc.)--turning (mainly forming)--grinding surface--engraving (such as knurling, printing LOGO, etc.)--heat treatment (in order to increase its hardness )--electroplating (nickel or chrome, etc.)--grab black, etc.
Four distinguish between good and bad
(1) Look at the surface: whether there are burrs, whether the specifications meet the size standards, whether there are scratches, etc. (2) Endogenous: use special tools to measure torque and hardness; measure size; salt spray test, etc.
Note: When the hexagonal or twelve-sided opposite side of the socket wrench is less than or equal to 32MM, its hardness value is not lower than HRC39, and when it is greater than 32MM, the hardness is not lower than HRC35.
