This automotive hollow spline shaft is a high‑precision transmission and sliding‑guide component for car starter motors.
Manufactured by one‑piece cold‑extrusion forming, the shaft has compact and continuous metal‑fiber structure. It delivers high surface hardness, outstanding wear resistance and great shock‑resistance to withstand heavy loads from repeated engine starts.
Equipped with outer splines and a full‑length through‑hole, the shaft transfers rotational power reliably to the bendix drive. Its hollow bore enables the bendix assembly to slide smoothly back and forth, completing engagement and disengagement with the engine flywheel. Locating pin holes on the top provide secure positioning and prevent slippage during operation.
Strict tolerance control over splines, inner bore and mounting holes ensures low‑friction movement, stable power delivery and trouble‑free long‑time service. The part is available for OEM supply and aftermarket replacement, and custom‑made production based on drawings or samples is supported. Every unit is fully inspected before delivery.
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