Steering Shaft
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Shaft,Upper Assist
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Shaft,Lower Assist
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Raw material：Medium-carbon steel
One of external spline and internal spline formed by cold forging process,another external spline machined by gear shaping machine,thread and other feature machined by turning,milling and grinding process
Pre-treatment：Cold drawing
Hardness requirements：HRA58~64
Tolerance requirements on outer diameter：10 micron
Tolerance requirements on inner diameter：15 micron
Laser marking with 2D barcode for traceability