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Steering Shaft
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Raw material：16MnCr5HH or ZF6
External spline and internal spline machined by spline hobbing process, other feature machined by turning and grinding process
Heat treatment：carburizing treatment to HRC 59~63
Case depth：0.4~0.7 mm.
Core strength：>=900 N/mm²
Tolerance requirements on outer diameter：8 micron
Roundness requirements：0.003
Roughness requirements：Rz0.7