HPI Savage 21 112mm Titanium Main Shaft Dog Bone TSAV1037DL by GPM  [TSAV1037DL]

Precision titanium main shaft dog bone

This 112mm titanium dog bone is a CNC-friendly aftermarket replacement designed for HPI Savage 21 main shaft applications, supplied as a single piece for hobbyist drivetrain use. It fits the Savage submodels listed in the compatibility box and replaces standard steel or alloy dog bones to deliver improved corrosion resistance and consistent connection between the main shaft and outdrives.

Technical fitment guidance: remove the rear driveline assembly following the chassis service instructions, slide the dog bone into the outdrive and main cup, and secure any retaining pins or clips present. No modification to the main shaft is required for the stated compatible models. During reassembly verify unconstrained rotation and correct centring before applying final torque to mating fasteners.

Engineering notes: titanium offers a favourable strength-to-weight ratio and a different stiffness profile versus steel, which helps maintain drivetrain geometry under load and reduces bending that can impair gear mesh and power transfer. Use this component during preventative maintenance cycles or when altering differential or outdrive geometry for tuning.