HPI Baja 5b/5b Ss/5T Steel Clutch Bell 5mm Bore SBJ613 by GPM  [SBJ613]

Durable steel clutch bell for Baja platforms

The SBJ613 clutch bell is a steel 5mm-bore replacement intended for the HPI Baja 5b, 5b Ss and 5T models listed in the product title. It is supplied as a single-piece set and includes the retaining screw and lock nut needed to secure the bell to compatible pinion arrangements.

This part functions inside the RC driveline, transferring torque from the motor pinion to the clutch assembly. Steel construction gives greater wear resistance compared with softer materials. The 5mm internal bore is the critical fit dimension, so check your motor or pinion shaft diameter before installation.

Installation notes: remove the existing clutch bell, slide SBJ613 onto the pinion or shaft aligned to the 5mm bore, fit the supplied screw and lock nut, and apply a controlled torque to avoid loosening under vibration. Verify thread engagement and inspect runout after fitting to ensure smooth interaction with the spur gear and clutch shoes.

Replace a worn bell or match gearing on HPI Baja 5b series models with the SBJ613, taking care with alignment and secure fastening to maintain reliable driveline behaviour.