The 679 Open is a precision-engineered, ultra-thin miniature ball bearing designed for high-velocity applications where rotational resistance must be kept to an absolute minimum. With a 9mm bore and a slim 14mm outer diameter, this "Open" type bearing features no seals or shields, allowing for the lowest possible starting torque and unrestricted rotational flow. This design is specifically intended for use in clean, controlled environments or within enclosed housings where external lubrication—such as oil baths or mist—is readily available to maintain the bearing’s internal components.