1. Product Overview S7204CD/HC is super precision single row angular contact ball bearing. S : Universal matchable design CD : 15° contact angle, high-capacity D internal geometry HC : Hybrid construction, steel inner & outer rings + silicon nitride ceramic rolling elements with electric insulation capability Open structure supports circulating oil lubrication. It bears combined radial load and one-way axial load. Single bearing can be arranged back-to-back (DB), face-to-face