D.3004 is a reference to a pawbol, which is a type of plastic bearing used to mount rotors in motors and fans. It is typically manufactured from polyethylene or polyacetal and is used to reduce friction and absorb stress. The D.3004 pawbol features a large hoop that provides extra torque and a highly effective outer seal to help keep the rotor securely in place. It also has a wide diameter and is equipped with a sumitomo mount for extra stability, and has a rated bearing life of up to 10,000 hours.