7mm*10mm*18mm Brush Motor Set Replace Parts for Power Tools Carbon Brush

7mm×10mm×18mm Brush Motor Set Replace Parts for Power Tools Carbon Brush

Key Information Analysis:

1. Product Attribute: Replacement Carbon Brush Set for Power Tool Brush Motors
   Made by pressing a mixture of high-density graphite and an appropriate amount of copper powder (copper content approximately 25%-35%), it has three core characteristics:
   • Precise adaptability: Optimized for the compact structure of power tool motors, the 7×10mm cross-sectional size can tightly fit into the corresponding specification of brush holders, reducing poor contact caused by installation gaps;
   • Wear-resistant and long-lasting: The material has undergone special processing, with better friction resistance than ordinary carbon brushes. The 18mm length provides sufficient wear allowance, with a service life of 1000-1600 hours, adapting to the high-frequency operation needs of power tools;
   • Set synergy: Including 2 carbon brushes of the same specification, ensuring synchronous replacement of both sides of the motor, maintaining the balance of current conduction, and avoiding power fluctuations or abnormal sparks caused by uneven wear on one side.
2. Compatibility Range:
   Based on the 7×10×18mm specification, it is suitable for brushed motors of various small and medium-sized power tools. Common compatible equipment includes:
   • Medium-sized handheld tools: such as impact drills, medium-sized sanders, polishers, reciprocating saws, etc. (power 400-1000W);
   • Portable devices: some models of jigsaws, edge trimmers, electric wrenches, etc.
     The core of compatibility is that the size must completely match the motor's brush holder (with an error of ≤0.2mm). In particular, the precision of the width (10mm) and thickness (7mm) must be strictly controlled to avoid loose installation or carbon brush jamming due to dimensional deviation.
3. Size Specifications: 7mm×10mm×18mm
   This size belongs to the category of small and medium-sized carbon brushes. The 18mm length provides a reasonable wear buffer for the continuous operation of the tool. The combination of 7mm thickness and 10mm width is suitable for most standard brush holder structures. The dimensional accuracy is controlled within ±0.1mm to ensure uniform contact between the carbon brush and the commutator, reducing vibration noise and electric sparks during operation.
4. Functions and Roles:
   • Serves as the "current conduction hub" of the motor, efficiently transmitting external current to the rotor windings through stable contact with the commutator, ensuring the power output of power tools during operations such as drilling, grinding, and cutting;
   • The self-lubricating property of graphite can reduce mechanical wear on the commutator, extend the service life of the motor, and reduce heat accumulation caused by friction, lowering the risk of tool overheating.
5. Replacement Tips:
   The carbon brush set 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 6mm);
   • There are significantly more sparks at the carbon brush during motor operation, accompanied by a "sizzling" abnormal sound and a burning smell;
   • The output power of the tool decreases, such as reduced rotational speed, weakened impact force, or lower operating efficiency.