Electric Brushes Graphite Carbon Brush 7*14*19 Power Tool Parts

Electric Brushes Graphite Carbon Brush 7×14×19 Power Tool Parts

Key Information Analysis:

1. Product Attribute: Graphite Carbon Brush for Electric Power Tools (as Parts)
   Made by pressing a mixture of high-purity natural graphite and an appropriate amount of copper powder (copper content approximately 20%-30%), it has three core characteristics:
   • Optimized graphite properties: The self-lubricating nature of natural graphite reduces wear on the commutator while lowering operating noise, making it suitable for scenarios requiring low-noise operations (such as interior decoration and precision grinding);
   • Precise size adaptation: The 7×14mm cross-sectional size is specially designed for small and medium-sized brush holders, and the 19mm length provides sufficient wear allowance, fitting most compact-structured power tool motors and reducing poor contact caused by installation gaps;
   • Working condition adaptability: The material balances conductivity and wear resistance, adapting to the needs of power tools for high-frequency start-stop and continuous operation (such as continuous drilling and grinding), with a service life of about 800-1500 hours.
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, etc. (power 300-800W);
   • Portable devices: some models of edge trimmers, small angle grinders, electric screwdrivers, etc.
     The core of compatibility is that the cross-sectional size (7×14mm) must completely match the brush holder (with an error of ≤0.2mm), and the 19mm length must correspond to the original carbon brush specifications of the equipment to avoid jamming due to excessive length or insufficient contact pressure due to excessive shortness.
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 fits 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 excessive internal space of the motor due to being overly long. The dimensional accuracy is controlled within ±0.1mm to ensure uniform contact with the commutator, reducing sparks and vibration 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 power tools during operations such as drilling, grinding, and cutting;
   • The high-temperature resistance of graphite can cope with frictional heat generated during motor operation (operating temperature up to 120℃ and above), avoiding softening or fragmentation of the carbon brush due to overheating and maintaining tool stability.
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;
   • The output power of the tool decreases, such as reduced rotational speed, insufficient power, or even delayed startup.