The EMax MT1804 and MT1806 are small brushless motors commonly used in various RC (Radio-Controlled) applications, such as drones and quadcopters. The "Prop Cap Nut" you mentioned is a component used to secure the propeller to the motor shaft. These motors typically come with a set of propeller adapters and nuts that allow you to attach the propellers to the motor.

The terms "CCW Thread" and "CW Rotation" refer to the threading direction of the prop cap nut and the rotation direction of the motor:

Name: EMax MT1804 MT1806 Brushless Motor Prop Cap Nut CW-CCW 1pcs
SKU: 1726583

CCW Thread (Counter-Clockwise Thread): This means that the nut is designed to be screwed onto the motor shaft in a counterclockwise direction (when looking at the motor from the front). These nuts are used for motors that rotate counterclockwise when viewed from the front, which is often used for the front left and rear right motors on a quadcopter.

CW Rotation (Clockwise Rotation): This indicates that the motor is designed to rotate in a clockwise direction when viewed from the front. Correspondingly, you would use a nut that has a clockwise thread to secure the propeller in place. CW rotation motors are often used for the front right and rear left positions on a quadcopter to achieve stable flight.

It's essential to use the correct prop cap nut for your motor's rotation direction to ensure that the propeller is securely attached. Using the wrong nut can lead to propeller loss during flight, potentially causing instability or even a crash.