7 X 14 X 19mm Power Tool Carbon Brushes for Replacement Motor

7×14×19mm Power Tool Carbon Brushes for Replacement Motor

Key Information Analysis:

1. Product Attribute: Carbon Brushes for Power Tool Motor Replacement
   Made by pressing a mixture of high-purity graphite and an appropriate amount of copper powder (copper content approximately 20%-30%) and subjected to precision processing, it has three core characteristics:
   • Strong adaptability: The 7×14mm cross-sectional size is specially designed for brush holders of small and medium-sized power tools, which can be tightly embedded into the mounting grooves of corresponding specifications, reducing poor contact caused by excessive gaps. It is suitable for motors with a power of 300-800W;
   • Wear-resistant and durable: The material has high density and excellent friction resistance. The 19mm length provides sufficient wear allowance, with a service life of 800-1500 hours, which can adapt to the working conditions of high-frequency operations of power tools (such as continuous drilling and grinding);
   • Stable conduction: The scientific ratio of graphite and copper reduces contact resistance, ensuring stable current transmission, reducing sparks during motor operation, lowering the risk of overheating, and extending the overall service life of the tool.
2. Compatibility Range:
   Based on the 7×14×19mm specification, it is suitable for brushed motors of various small and medium-sized power tools. Common compatible equipment includes:
   • Handheld power tools: such as medium-sized electric drills, sanders, polishers, jigsaws, small angle grinders, etc.;
   • Portable devices: some models of edge trimmers, electric screwdrivers, reciprocating saws, etc. (power 300-800W).
     The core of compatibility is that the size must completely match the motor brush holder (with an error of ≤0.2mm). In particular, the 7mm thickness and 14mm width must strictly correspond to the original specifications to avoid installation difficulties or abnormal operation noise caused by dimensional deviation.
3. Size Specifications: 7×14×19mm
   This size belongs to the category of small and medium-sized carbon brushes. The combination of 7mm thickness and 14mm width is suitable for most standard brush holder structures. The 19mm length design balances wear buffer and installation space constraints – it provides sufficient wear allowance for continuous operations without occupying limited internal space of the motor due to being too long. The dimensional accuracy is controlled within ±0.1mm to ensure uniform contact with the commutator and reduce vibration and noise during operation.
4. Functions and Roles:
   • As the "current conduction hub" of the motor, it stably transmits external current to the rotor windings through sliding contact with the commutator, ensuring continuous power output of power tools during operations such as drilling, grinding, and cutting;
   • The self-lubricating property of the material can reduce mechanical wear on the commutator and help dissipate heat generated by friction, avoiding carbon brush softening or motor damage caused by high temperatures.
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 6.3mm);
   • There are significantly more sparks at the carbon brush during motor operation, accompanied by a "sizzling" friction sound and a burning smell;
   • The output power of the tool decreases, such as reduced rotational speed, insufficient power, or even delayed start-up or jamming.