6004-2Z Single Row Deep Groove Ball Bearing 20x42x12mm Double Metal Shields Low Noise For Motors Fans Power Tools Product Overview 6004-2Z is a single row deep groove ball bearing with double-sided steel shields. It features metric dimensions 20×42×12 mm, crafted from high-strength GCr15 bearing steel with stamped steel retainer. The 2Z metal shield structure effectively blocks dust and solid particles, delivering reliable dust-proof performance for ordinary working