Technical Requirements:
1) 1. Total number of coils: 14.8.
2) Number of active coils: 12.8.
3) Free height: 200mm.
4) Port deburring.
5) Both ends of the surface were wore off, circumference is not less than 3/4.
6) Shot blasted: pills ¢ 0.8mm ~ ¢ 1.2mm, intensity 0.2 ~ 0.45A, coverage of 80%.
7) Surface treatment: plating.