The cutting edge hardness of the blade is 55-62HRC.
The hardness of bolts and central shaft is 33-40HRC
There should be no cracks, rust, harmful scars, burrs and other defects on the surface of each part.
All parts subjected to surface treatment must be uniform in color and free of obvious spots, pits, omissions, bubbles, peeling layers and flow marks.
The surface roughness Ra of the two inclined surfaces of the blade edge is not more than 3.2um, and the surface roughness Ra of the remaining cutting parts of the blade
Not more than 6.3um.
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