The 6703 is a premium open-type thin-section ball bearing designed for high-precision assemblies where external lubrication systems are utilized. By eliminating seals and shields, this model offers the absolute minimum starting torque and rotational resistance, allowing for seamless operation in high-speed oil-bath or oil-mist environments. Its 17mm bore and 23mm outer diameter provide a large inner diameter relative to its slim 4mm width, making it a favorite for hollow-shaft sensors and high-frequency instrumentation.