SZM GR6 PRIMARY INPUT CLUTCH SHAFT 300M – HEAVY DUTY NISSAN GTR R35

Hollow input shafts, both OEM and aftermarket, share a common high-power failure mode in the GR6: fatigue cracking around the stem, where the internal bore reduces cross-sectional strength precisely where loads peak under launch.

This Primary Input Shaft is machined as a fully solid stem from billet high-alloy, proprietary-grade steel used in premium aftermarket GR6 shafts. By eliminating the hollow core entirely, torsional strength and fatigue life are maximized through the critical failure zone — no bore, no internal stress riser, no weak point.