6912 MM Carbon Brush for Electric Motor and Power Tools 1251100 Angle Grinder

I. Basic Information and Core Parameters

• Dimension Specifications

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

• Compact size suitable for carbon brush slots in small angle grinder motors.

• Material Characteristics

• Made of carbon-graphite composite with 15–20% copper powder, featuring conductivity up to 10⁻⁵Ω·m and wear coefficient <0.12mm/100h, adapted to high-speed operation of angle grinders.

II. Compatible Equipment and Model Details

• Applicable Tool Types

• Dedicated to 125/1100 series angle grinders, commonly used in 1100W models such as Bosch GWS 10-125 and DeWalt D28403.

• Compatibility Logic

• Designed for high-speed operation of angle grinders (10,000–12,000 RPM), with spring pressure ranging 1.5–2kg to ensure stable contact between the carbon brush and commutator at high speeds.

III. Technical Parameters and Working Mechanism

1. Current Conduction Principle

• Maintains sliding contact with the commutator via spring pressure to transmit current to the rotor windings, driving the grinding wheel for high-speed cutting or polishing (e.g., 11,000 RPM for an 1100W angle grinder).

2. Wear Replacement Thresholds

• Replace immediately when the remaining length is less than 1/2 of the original, or when abnormal sparking or severe body vibration occurs to prevent motor burnout due to commutator wear.

IV. Installation and Maintenance Guidelines

• Installation Steps

1. Power off and remove the angle grinder's rear cover; extract the old carbon brush and spring.

2. Clean the commutator surface with alcohol to remove carbon powder, and inspect for grooves or burn marks.

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 30 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 (10–15A) and compatible voltage (220V/110V), and pay attention to voltage compatibility for imported models.

• Professional Tips

• If the angle grinder experiences sudden speed drops or abnormal noise, the carbon brush may be worn or the spring failed. Replace the entire carbon brush assembly (including the spring) and check commutator wear depth (grind for repair if exceeding 0.5mm).