Miniature Metric Series, Single Row Deep Groove Ball Bearing with Two Shields - (4x16x5 mm)

634-ZZ is a 630 miniature series double shielded single row deep groove radial ball bearing with a 4 mm bore, 16 mm outside diameter, and 5 mm width. Built with precision-ground raceways and steel balls for smooth rotation in compact mechanical assemblies requiring a larger outer diameter miniature bearing. Double metal shields help retain lubricant while reducing running drag compared with rubber sealed designs, supporting moderate to high-speed miniature applications. Commonly used in hobby motors, RC cars, small fans, micro pulleys, and precision instruments. Product Specifications: Bearing Type: Single Row Deep Groove Radial Ball Bearing Part Number: 634-ZZ Series: 630 Miniature Series Inner Diameter (ID): 4 mm Outer Diameter (OD): 16 mm Width (W): 5 mm Closure Type: Double Metal Shielded Load Direction: Radial and Light Axial Loads Precision Rating: ABEC 1 Material: Chrome Steel Lubrication: Pre-Lubricated Applications: Hobby motors RC cars Small fans Micro pulleys Precision instruments