Miniature Metric Series, Single Row Deep Groove Ball Bearing with Two Shields - (4x9x4 mm)

684-ZZ is a 680 miniature series double shielded single row deep groove radial ball bearing with a 4 mm bore, 9 mm outside diameter, and 4 mm width. Built with a compact thin-section profile, precision-ground raceways, and steel balls for smooth rotation in small shaft assemblies. Double metal shields help retain lubricant while keeping running resistance lower than rubber sealed designs, making this bearing suitable for miniature moderate to high-speed applications. Commonly used in micro motors, RC equipment, model mechanisms, compact robotics, and precision instruments. Product Specifications: Bearing Type: Single Row Deep Groove Radial Ball Bearing Part Number: 684-ZZ Series: 680 Miniature Series Inner Diameter (ID): 4 mm Outer Diameter (OD): 9 mm Width (W): 4 mm Closure Type: Double Metal Shielded Load Direction: Radial and Light Axial Loads Precision Rating: ABEC 1 Material: Chrome Steel Lubrication: Pre-Lubricated Applications: Micro motors RC equipment Model mechanisms Compact robotics Precision instruments