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Pinion
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Raw material：Low-carbon steel
Two of external spline formed by spline rolling and cold forging process,pinion machining after heat treatment by hard gear hobbing machine,other feature machined by turning,milling and grinding process
Heat treatment：Carburizing and quenching+low tempering
Hardness requirements：HRC 58~63
Tolerance requirements on outer diameter：12 micron
Tolerance requirements on inner diameter：22 micron