Motor Coals 6.2*12*19.5/20.7mm Carbon Brush

Power Tool Spare Parts Electric Motor Coals 6.2×12×19.5/20.7mm Carbon Brush

Key Information Analysis:

1. Product Attribute: Carbon Brush for Electric Motor as Power Tool Spare Parts
   Made by pressing a mixture of high-purity graphite and an appropriate amount of metal powder (such as copper and tin), it has two core characteristics:
   • Dual-specification adaptability: The same cross-sectional size (6.2×12mm) is paired with two lengths (19.5mm/20.7mm), adapting to brush holders with different installation depths. There is no need to purchase separately due to length differences, improving versatility;
   • Optimized durability: The dense and impact-resistant material, with a copper content of about 20%-30%, balances conductivity and wear resistance. It can adapt to complex working conditions of power tools, such as high-frequency start-stop and continuous operation, extending service life (about 1000-1600 hours).
2. Compatibility Range:
   Based on the 6.2×12×19.5/20.7mm specification, it is suitable for brushed motors of various small and medium-sized power tools. Common scenarios include:
   • Handheld power tools: such as medium-sized electric drills, angle grinders, sanders, reciprocating saws, etc. (power 500-1200W);
   • Portable equipment: some models of jigsaws, polishers, impact wrenches, etc.
     The core of compatibility is that the cross-sectional size (6.2×12mm) must completely match the brush holder (with an error of ≤0.2mm). The two length specifications correspond to the installation spaces of tools from different brands or models, and must strictly match the length of the original carbon brush to avoid over-tight installation due to excessive length or insufficient contact pressure due to excessive shortness.
3. Size Specifications: 6.2×12×19.5/20.7mm
   This size belongs to the category of small and medium-sized carbon brushes. The 6.2mm thickness and 12mm width are suitable for most compact-structured brush holders. The length difference of 0.9mm between 19.5mm and 20.7mm is specially designed for fine-tuning the installation depth. The dimensional accuracy is controlled within ±0.1mm to ensure uniform contact between the carbon brush and the commutator, reducing sparks and vibration noise during operation.
4. Functions and Roles:
   • Serves as the "current conduction medium" of the motor, stably transmitting external current to the rotor through sliding contact with the commutator, ensuring continuous power output of the power tool during operations such as drilling and grinding;
   • The dual-length design meets the assembly needs of different equipment, reducing tool maintenance delays caused by mismatched sizes and improving the efficiency of spare part replacement.
5. Replacement Tips:
   The carbon brush should be replaced in time when the power tool shows the following conditions:
   • The carbon brush is worn down to less than 1/3 of its original length (about 6.5-7mm);
   • There are significantly more sparks at the carbon brush during motor operation, accompanied by a burning smell;
   • The output power of the tool decreases, such as reduced rotational speed or weakened impact force.