Carbon Brush 9mm X 16mm X 17.5/18.5mm Motor Accessories

Power Tool Carbon Brush 9mm × 16mm × 17.5/18.5mm Motor Accessories

Key Information Analysis:

1. Product Attribute: Specialized Carbon Brush for Power Tool Motors (as Accessories)
   Made by pressing a mixture of high-density graphite and a high proportion of copper powder (copper content approximately 30%-40%), it has three core characteristics:
   • High load resistance: The large cross-sectional size (9×16mm) and high copper content formula can carry larger currents, adapting to medium and high-power motors (800-2000W) and withstanding the high-temperature environment of power tools during long-term heavy-load operations;
   • Dual-length adaptability: The same cross-sectional size is paired with two lengths (17.5mm and 18.5mm), and the small 1mm length difference can precisely adapt to the installation depth of brush holders caused by design differences in tools of different brands or models, improving versatility;
   • Strong structural stability: The dense and impact-resistant material can cope with the high-frequency vibration of power tools, reducing carbon brush fragmentation or poor contact caused by vibration.
2. Compatibility Range:
   Based on the 9×16×17.5/18.5mm specification, it is suitable for brushed motors of various medium and large power tools. Common compatible equipment includes:
   • Industrial-grade power tools: such as heavy-duty angle grinders, large grinders, high-torque electric drills, industrial-grade reciprocating saws, etc.;
   • Professional equipment: stone cutting machines, concrete vibrators, heavy-duty polishers, etc. (power 800-2000W).
     The core of compatibility is that the cross-sectional size (9×16mm) must completely match the brush holder (with an error of ≤0.2mm). The two length specifications correspond to the installation spaces of different equipment respectively, 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: 9mm × 16mm × 17.5/18.5mm
   This size belongs to medium and large carbon brushes. The 9mm thickness and 16mm width provide a larger contact area to ensure stable current conduction; the 1mm length difference between 17.5mm and 18.5mm is specially designed for fine-tuning the installation depth, covering subtle dimensional deviations caused by production batches or brand differences. The dimensional accuracy is controlled within ±0.1mm to avoid increased motor sparks or abnormal operation noise caused by dimensional errors.
4. Functions and Roles:
   • Serves as the "core of power conduction" for power tool motors, stably transmitting external current to the rotor through close contact with the commutator, ensuring continuous power output of the tool during heavy-load operations such as cutting, grinding, and drilling;
   • The mixed material of graphite and copper combines wear resistance and thermal conductivity, reducing wear of the carbon brush itself while quickly dissipating heat generated by friction, extending the service life of the motor.
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 5.8mm for the 17.5mm specification and about 6.2mm for the 18.5mm specification);
   • There are significantly more sparks at the carbon brush during motor operation, accompanied by a burning smell or continuous abnormal noise;
   • The output power of the tool decreases, such as reduced rotational speed, lower cutting/grinding efficiency, or insufficient torque.