Original Makita 452126-8 — Gear Shaft for rotary hammer drills. This plastic gear shaft is the direct-fit internal gear shaft used in Makita HR3210C-series and several related rotary hammers to restore smooth power transfer, impact performance and gearbox alignment.

Fits models including HR3210C, HR3210FCT, HR3540C, HR3541FC (and compatible HR3200/HR3210 variants), making it the correct replacement when worn teeth, slipping drive or gearbox noise appear.

Replaces Makita part 450242-0 and is sold as part number 452126-8 for a like‑for‑like repair — install it to return original Makita drivetrain geometry and reduce vibration and premature wear.