High-Torque RS550 21V Brushed DC Motor with 14-Tooth Gear for Cordless Drills & Mini Chainsaws

Revive sluggish, burned-out cordless power tools with a high-torque direct replacement motor. Engineered specifically for 18V to 21V cordless power tools, this RS550 21V high-torque brushed DC motor with 14-tooth drive gear delivers the aggressive RPM and sustained cutting power needed to tackle heavy drilling, fastening, and timber cutting. Featuring heavy-gauge copper windings and high-flux permanent magnets, it generates smooth, reliable rotational force under heavy mechanical loads. The pre-installed 14-tooth hardened steel pinion gear meshes smoothly with standard cordless tool planetary gearboxes, mini chainsaws, and reciprocating logging saws, eliminating the hassle of pressing on small gears by hand. Equipped with an internal cooling fan to channel airflow across the brushes and armature, this replacement cordless drill and saw motor restores brand-new performance to your favorite shop tools.

Key Features

• High-Torque 21V Performance: Delivers rapid acceleration and high rotational speed under heavy cutting and drilling resistance.

• Pre-Pressed 14-Tooth Steel Pinion: Comes factory-fitted with a precision-machined 14-tooth hardened metal gear for direct gearbox engagement.

• High-Conductivity Copper Windings: Thick copper armatures maximize electrical efficiency while reducing resistance and internal heat.

• Integrated Forced-Air Cooling: Built-in rotor cooling fan circulates air through the casing to dissipate thermal buildup during extended use.

• Universal RS550 Form Factor: Standard cylindrical dimensions and front mounting screw holes match common cordless drills, impact wrenches, and mini saws.

• Cost-Effective Tool Repair: Swaps out easily with worn-out or smoked motors so you can rebuild your power tools without buying entire bare units.

Product Specs

• Motor Model: RS550 Brushed DC Motor

• Operating Voltage Range: 18V to 21V DC

• Gear Specification: 14 Teeth (Pre-installed steel gear)

• Construction: All-metal casing, pure copper core windings, carbon brush assembly

• Cooling System: Internal centrifugal cooling fan

• Applications: Cordless drills, impact drivers, electric wrenches, mini logging chainsaws, and pruning saws