Graphite Brush 8*14*20mm Power Tools Carbon Brush Assembly

8×14×20mm Graphite Brush – Power Tools Carbon Brush Assembly

Key Information Analysis:

1. Product Attribute: Graphite Carbon Brush Assembly for Power Tools
   Made by pressing a mixture of high-purity flake graphite and an appropriate amount of copper powder (copper content approximately 25%-35%), followed by precision machining and pre-assembly of components, it has three core characteristics:
   • Integrated design: Includes the carbon brush body, pressure spring, and mounting clips, allowing direct replacement without additional accessories. This simplifies the installation process (especially suitable for non-professional maintenance scenarios) and ensures uniform pressure between the carbon brush and commutator after replacement, reducing the risk of poor contact;
   • Optimized graphite properties: The self-lubricating nature of high-purity graphite reduces wear on the commutator while lowering operating noise, making it suitable for scenarios requiring low-vibration operations (such as furniture polishing and fine metal grinding);
   • Durability adaptation: The 8×14mm cross-sectional size is compatible with motors ranging from 500-1200W. The 20mm length provides sufficient wear allowance, with a service life of 1000-1800 hours, adapting to high-frequency, medium-heavy load operations of power tools (such as continuous drilling and sanding).
2. Compatibility Range:
   Based on the 8×14×20mm specification and assembly design, it is suitable for brushed motors in various small and medium-sized power tools. Common compatible equipment includes:
   • Medium-sized handheld tools: such as impact drills, sanders, polishers, jigsaws, and medium-sized angle grinders;
   • Professional equipment: some models of edge trimmers, reciprocating saws, and small cutting machines (power 500-1200W).
     The core of compatibility lies in size and component compatibility – the 8×14mm cross-section must fit perfectly with the inner cavity of the brush holder (with an error of ≤0.2mm), and the spring force must match the motor's design standards to avoid excessive wear of the carbon brush due to excessive pressure or abnormal sparks due to insufficient pressure.
3. Size Specifications: 8×14×20mm
   This size belongs to the category of small and medium-sized carbon brushes. The 8mm thickness balances structural strength and installation space, the 14mm width provides a stable current conduction area, and the 20mm length includes approximately 5mm of safety wear allowance. The dimensional accuracy is controlled within ±0.1mm to ensure uniform contact with the commutator, while the overall size of the assembly fits most standard carbon brush mounting slots, reducing assembly interference.
4. Functions and Roles:
   • Core conduction function: Through sliding contact between graphite and the commutator, it stably transmits external current to the motor rotor, ensuring continuous power output of power tools during operations such as drilling, grinding, and cutting;
   • Component synergy: The spring provides constant pressure, ensuring the carbon brush automatically compensates for contact gaps as it wears, while the mounting clips fix the assembly in place, preventing displacement of the carbon brush due to vibration during operation and improving the stability of current conduction.
5. Replacement Tips:
   The carbon brush assembly 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 6.7mm), or has cracks or chips;
   • There are significantly more sparks at the carbon brush during motor operation, accompanied by a "sizzling" noise or local overheating (perceivable by touching the motor housing);
   • The output power of the tool fluctuates, such as unstable rotational speed or inconsistent grinding/drilling force.