I. Basic Information and Core Parameters

• Product Code: CB50

• Dimension Specifications:

• Standard type: Thickness 5mm × Width 8mm × Length 11.5mm

• Extended type: Thickness 5mm × Width 8mm × Length 13mm

• Product Composition:
  Carbon brush set (typically including 2 carbon brushes + 2 springs), suitable for specific power tool motor models.

II. Compatible Equipment and Model Details

• Applicable Tool Types:

• Suitable for small power tools such as electric drills, angle grinders, and cut-off machines, commonly used in 500–700W models from brands like DeWalt and Makita.

• Compatibility Logic:

• Designed for medium-low speed conditions (suitable for 3,000–7,000 RPM), with spring pressure ranging 1.0–1.5kg, adapted to daily light-load operation scenarios.

III. Technical Parameters and Working Mechanism

1. Material Characteristics:

• Made of carbon-graphite composite with 12–18% copper powder, conductivity up to 1.2×10⁻⁵Ω·m class, wear coefficient <0.12mm/100h.

2. Current Conduction Principle:

• Maintains sliding contact with the commutator via spring pressure to transmit current to the rotor windings, driving tool operation.

3. Wear Replacement Thresholds:

• Replace immediately when the remaining length is less than 1/2 of the original, or when abnormal sparking or unstable tool speed occurs.

IV. Installation and Maintenance Key Points

• Installation Steps:

1. Power off and remove the tool's rear cover, then take out the old carbon brush and spring.

2. Clean the commutator surface with alcohol and inspect for burn marks.

3. Polish the new carbon brush arc with sandpaper to fit the commutator, and secure the spring in the fixing slot.

• Maintenance Recommendations:

• Inspect wear every 30 hours of use. It is recommended to replace carbon brushes and springs simultaneously to avoid uneven pressure caused by single-piece replacement.

V. Comparison with Other Carbon Brushes

VI. Purchase and Replacement Recommendations

• Specification Verification:

• In addition to dimensions, verify the current-carrying capacity of the carbon brush (7–9A) and compatible voltage (220V/110V).

• Professional Tips:

• If the tool has difficulty starting or makes abnormal noise, the carbon brush may be worn or the spring may be failed. It is recommended to replace the entire set and check the commutator wear depth (grind for repair if exceeding 0.3mm).