I. Basic Product Attributes

• Essential Positioning

• A 6.3×11×19/20mm carbon brush designed as a replacement part for power tools (electric drills, grinders, trimming machines).

• Core Function

• Serves as a current-conducting component in the motor, transmitting electrical energy through sliding contact with the commutator to drive the tool's rotor.

II. Compatible Equipment and Models

• Applicable Tool Types

• Electric drills, angle grinders, trimming machines, etc.

• Small to medium-sized power tools, including:

• Compatibility Logic

• The 6.3×11×19/20mm specification is universal, commonly used in models from brands like Bosch, DeWalt, and Makita (e.g., Bosch GBM 340 drill, Makita 9555NB angle grinder).

• The "19/20mm" length may indicate a floating range for compatibility with different motor batches; always verify against the old brush's dimensions before replacement.

III. Technical Parameters and Working Mechanism

1. Key Dimensions

• Thickness: 6.3mm × Width: 11mm × Length: 19/20mm, fitting standard motor brush slots.

2. Material Properties

• Typically made of electrographite or copper-included graphite composites, balancing conductivity (resistivity ~10⁻⁵Ω·m) and wear resistance (wear rate<0.1mm/100 hours).

3. Wear and Replacement Threshold

• Replace immediately when the remaining length is less than 1/2 of the original, or when abnormal sparking or reduced tool power occurs to prevent commutator damage.

IV. Installation and Maintenance Guidelines

• Installation Steps

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

2. Clean the commutator surface with alcohol to remove carbon dust and oil.

3. Ensure the new brush conforms to the commutator's arc (sand to adjust if needed), with spring pressure maintained at 1.5–2kg.

• Maintenance Tips

• Inspect wear every 50 hours of use; replace the brush and spring as a set for optimal pressure matching.

V. Comparison with Similar Products

VI. Purchase and Replacement Recommendations

• Specification Verification

• Beyond dimensions, confirm current-carrying capacity (typically 10–15A) and compatible voltage (12V/220V).

• Professional Advice

• If the tool shows difficult starting or unusual noise, the brush or spring may be worn. Replace the entire brush assembly (including spring) to ensure stable performance.