Electric Motor Carbon Graphite Brushes for 6x9x12MM Compatible With 550/650/750/780 Drill

I. Basic Information and Core Parameters

Dimension Specifications

• Thickness: 6mm × Width: 9mm × Length: 12mm

• Standard fit for carbon brush slots in small drill motors.

Material Characteristics

• Made of carbon-graphite composite (with 10–15% copper powder), balancing conductivity (resistivity 10⁻⁵Ω·m class) and wear resistance (wear rate <0.1mm/100h).

II. Compatible Equipment and Model Details

Applicable Tool Types

• Dedicated to 550/650/750/780 series drills, commonly used in low-power models like Bosch GBM 340 and DeWalt DCD701 (power 550–780W).

Compatibility Logic

• Designed for medium-speed drill operations (suitable for 3,000–6,000 RPM), with spring pressure ranging 1.2–1.8kg to ensure stable contact during daily drilling.

III. Technical Parameters and Working Mechanism

Current Conduction Principle

• Maintains sliding contact with the commutator via spring pressure to transmit current to rotor windings, driving the drill bit rotation (e.g., 5,000 RPM for a 650W drill).

Wear Replacement Thresholds

• Replace immediately when remaining length is less than 1/2 of the original, or when abnormal sparking or reduced drill power occurs to prevent motor jamming due to commutator wear.

IV. Installation and Maintenance Guidelines

Installation Steps

1. Power off, remove the drill's rear cover, and extract the old carbon brush and spring.

2. Clean commutator surface carbon powder with alcohol and inspect for minor scratches.

3. Polish the new carbon brush arc with sandpaper to fit the commutator, and secure the spring in the fixing slot (replace the spring if pressure is insufficient).

Maintenance Recommendations

• Inspect wear every 40 hours of use. When replacing carbon brushes, clean internal motor carbon powder to prevent heat dissipation issues from dust accumulation.

V. Comparison with Other Carbon Brushes

VI. Purchase and Replacement Recommendations

Specification Verification

• Beyond dimensions, confirm current-carrying capacity (8–10A) and compatible voltage (220V/110V), paying attention to voltage compatibility for some imported models.