Core Power of Lithium Tools: How Motor Models Affect Performance

01 Motor Model Meaning and Structural Differences

Common motor model format in lithium tools:
Diameter (mm) + Length/Height (mm)
For example, “4812” refers to a brushless motor with a 48mm diameter and 12mm height. Typical specifications include:

• 4812 / 4820 series

• 5212 / 5215 / 5220 series

• 6212 / 6215 / 6218 series

• 775 (traditional brushed motor)

Differences in magnet volume, coil space, and heat dissipation directly determine instantaneous torque, continuous power, and efficiency.

02 Performance Classification of Mainstream Motor Models

▶ 4812 / 4820 Series: Light-Duty Brushless Outrunner

• Diameter 48mm, compact, fast response.

• Applications: light drills, electric screwdrivers, small grinders, light-duty lawn tools.

• Features: low weight, quiet operation, limited torque reserve.

▶ 5215 / 5220 Series: Medium-Duty Brushless Outrunner

• Diameter 52mm, larger magnetic circuit.

• Applications: angle grinders, impact drills, lawn trimmers, mid-power chainsaws.

• Features: stable power output, balanced weight and torque; widely used in lithium tools.

▶ 6215 / 6218 Series: Heavy-Duty Brushless Outrunner

• Diameter 62mm, stronger magnets, high-torque platform.

• Applications: high-power angle grinders, professional brush cutters, large chainsaws (8–12 inch), high-torque wrenches.

• Features: high torque, capable of heavy loads, higher weight and production cost.

▶ 775 Motor (Brushed)

• Low cost, simple structure.

• Applications: budget drills, small lawn tools, vibrating sanders.

• Limitations: lower efficiency, high heat, faster wear; increasingly replaced by brushless motors.

03 How Motor Specifications Determine Tool Performance

Larger motor diameter = larger magnet area & magnetic flux = higher torque and continuous power. Professional lithium tools generally adopt 52 and 62 series motors.

04 How to Judge Tool Power by Motor Model

• Light-duty tools → 48 Series

• Home renovation & general construction → 52 Series

• Professional landscaping & industrial-grade tools → 62 Series

• Entry-level / budget → 775 Brushed

Motor model is the most direct and reliable parameter to assess a tool’s performance level.