6304-2Z Single Row Deep Groove Ball Bearing 20x52x15mm Double Metal Shields Low Noise For Motors Pumps Power Tools Product Overview 6304-2Z is a widely used deep groove series single row ball bearing fitted with double-sided metal dust shields, standard overall dimension 20×52×15 mm. It is precision processed from wear-resistant GCr15 bearing steel and equipped with stamped steel cage for flexible steel ball rolling. The 2Z metal shield structure effectively blocks dust and