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Shaft,Upper Assist
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Raw material：Medium-carbon steel
Pre-treatment：Cold drawing
Hardness requirements：HRA58~64
Both of external spline formed by cold forging process,the biggest OD also formed by cold forging process to save raw material,other feature machined by turning,milling and grinding process
Tolerance requirements on outer diameter：10 micron
Tolerance requirements on inner diameter：22 micron