Welcome to our store! 1,High Torque Rotor: 4 pole 12 slot high torque rotor design, low friction, low noise, high accuracy, strong torque and stable output power. 2,Applicable Model: Universal installation, 3.175mm shaft, suitable for all 1 or 10 brushless cars, M3 screw multiple installation methods. 3,Good Perforamnce: High hardness aluminum CNC shell, high temperature resistant copper coil, 0.35mm thickness silicon steel sheet, high magnetic permeability, high silicon content, good insulation and heat resistance. 4,Rotor Output Shaft and Bearings: Explosion proof rotor, high toughness stainless steel output shaft, high accuracy bearings make the motor super durable. 5,Detachable Structure: Convenient for cleaning and maintenance, effectively prolonging the service life of the motor and improving work efficiency. 6,Overheating Protection: The motor has a built in temperature sensor and interface, which can be used with the ESC to realize the motor overheating protection function. <p class="wang-edit-text"><p class="wang-edit-text"> Item Type: F540 Sensorless Brushless Motor Model: F540 Material: Aluminum Alloy, Copper, Steel Color: Black Red Weight: Approx. 187g or 6.6oz KV (RPM or Volt): 4370KV Output Power: 820W Maximum Voltage: andlt 12V Maximum Current: 68A​​ Number of Motor Poles: 4 IO: 3.5A Resistance (Ω): 0.0198 Maximum Speed: 50000 Motor Diameter: Approx. 35.8mm or 1.4in Motor Length: Approx. 50mm or 2.0in (Without Shaft) Shaft Diameter: Approx. 3.175mm or 0.1in Shaft Length: Approx. 15mm or 0.6in Application: Suitable for All 1 or 10 Brushless Cars <style> .wang-edit-text{ font-family:'Arial' !important } .wang-edit-text table { border-top: 1px solid 000 border-left: 1px solid 000 } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000 border-right: 1px solid 000 padding: 3px 5px } .wang-edit-text table th { text-align: center }< or style> 1 x F540 Sensorless Brushless Motor 4 x Screws 1 x Manual Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice