Replacement Spare Parts 6.9×10.8×19 MM Motor Carbon Brush

Key Information Analysis:

1. Product Attribute: Motor Carbon Brush as Replacement Spare Parts
   Made by pressing a mixture of high-density graphite and an appropriate amount of metal powder (such as copper and tin), it has good electrical conductivity, wear resistance, and high-temperature resistance. The scientific proportion of metal components (copper content is about 15%-25%) enables it to adapt to the current load requirements of different motors, reducing carbon brush aging caused by frictional heating and extending service life.
2. Compatibility Range:
   Based on the precise specification of 6.9×10.8×19mm, it is suitable for various small and medium-sized motors. Common applicable scenarios include:
   • Small industrial motors: Such as motors for conveying equipment, small fan motors, hydraulic pump drive motors, etc. (power 300-1000W);
   • Household appliance motors: Some models of washing machine motors, air conditioner fan motors, drive motors for kitchen appliances, etc.;
   • Power tool motors: Drive motors for medium-sized electric drills, sanders, polishers, 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 (10.8mm) and thickness (6.9mm) must be strictly controlled to avoid unstable installation or poor contact due to dimensional deviation.
3. Size Specifications: 6.9×10.8×19 MM
   This size belongs to the category of small and medium-sized carbon brushes. The length of 19mm provides a reasonable wear allowance (service life is about 800-1500 hours), adapting to most compact-structured brush holders. The precise non-integer size design (such as 10.8mm width) is customized for specific motor models and must be completely consistent with the original carbon brush specifications; otherwise, it may affect the stability of motor operation.
4. Functions and Roles:
   • Serves as the "current conduction medium" of the motor, stably transmitting external current to the rotor windings through close contact with the commutator, ensuring the motor starts and operates normally;
   • The lubricating property of graphite can reduce mechanical wear on the commutator, lower motor operating noise, and maintain the motor's efficient working state.
5. Replacement Tips:
   The carbon brush should be replaced in time when the motor shows the following conditions:
   • The carbon brush is worn down to less than 1/3 of its original length (about 6-7mm);
   • The surface of the carbon brush has cracks, chips, or burning marks;
   • There are significantly more sparks during motor operation, accompanied by abnormal vibration or reduced speed.