Kyosho LAW79B - Aluminum Center Shaft (88/7075/ZX7.5)  [KY-LAW79B]

This RC-scale center shaft is supplied as Kyosho part LAW79B and is specified as an aluminum center driveline component for the LAZER ZX7.5 family. The naming indicates 88/7075 aluminium as the material reference, which points to a machined aluminium shaft intended for use as a direct replacement in the ZX7.5 center driveline assembly.

The role of a center shaft in an RC driveline is to transmit torque between gearbox outputs and the differential or intermediate gears, while maintaining alignment through bearings and housings. When fitting LAW79B, check bearing clearance and retention hardware for wear, confirm smooth rotation before final assembly, and verify that mating gears or couplers engage without binding. Small adjustments to bearing preload and shaft seating can affect driveline noise and efficiency, so proceed with measured tuning rather than forceful fitment.

Materials like 7075-series aluminium offer a balance of stiffness and machinability for RC parts, but service life depends on drivetrain load and maintenance. Regular inspection of the shaft surface, keyways, and any set-screw interfaces will help detect early wear. Replace the shaft if you observe scoring, burrs, or persistent vibration that simple bearing or gear service does not cure.