This is a power tool accessory, specifically a carbon brush of model MK CB350, designed exclusively for HR4001C and HR4011C power tool models—a key consumable component in the motors of these tools.
Product Type: Carbon Brush
Made of conductive materials like graphite, it is a core component of the motor. Its function is to conduct electrical current from the power source to the motor’s rotating rotor (via contact with the commutator), driving the motor to operate and thus enabling the tool’s functions (such as drilling or impacting).
Model and Compatibility:
The model is MK CB350, where "MK" may be a brand or series identifier, and "CB350" is a specific specification code that defines its dimensions, conductivity, and other parameters.
Exclusively designed for the HR4001C and HR4011C power tools (these are likely Hitachi’s hammer drills or impact drills, as the HR series is common to the brand). Its size and specifications perfectly match the motor brush holders of these two tool models.
Function and Replacement Needs:
As a consumable, the carbon brush gradually wears down due to friction with the commutator during use.
Replacement is required when the brush is worn to about half its original length, or when the motor produces abnormal sparking, the tool loses power, or operates with unusual noise. This protects the motor and maintains the tool’s normal performance.
In summary, this is a dedicated carbon brush accessory for HR4001C and HR4011C power tools, crucial for ensuring stable operation of the tool’s motor.
