WHAT YOU GET 20 Donepart 684ZZ miniature deep groove ball bearings. Each measures 4mm bore x 9mm OD x 4mm width, with double metal shields (ZZ) on both sides. 100% GCr15 chrome steel. Factory pre-lubricated. WHERE THE 684ZZ FITS The 684ZZ is an ultra-miniature bearing found in micro electric motors, RC car and helicopter drivetrains, 3D printer extruders and filament guides, small rotary tools, office equipment, and precision hobby mechanisms. If your old bearing reads 684ZZ or 684-ZZ, confirm 4x9x4mm dimensions and this is the direct replacement. SPECIFICATIONS Model: 684ZZ · Pack: 20 Bearings Bore (ID): 4mm (0.157") · OD: 9mm (0.354") · Width: 4mm (0.157") Material: GCr15 Chrome Steel · Shields: ZZ Double Metal Pre-Lubricated: Yes · Cross-reference: 684ZZ, 684-ZZ

• Fits Micro Motors, RC Models, 3D Printers, and More: The 684ZZ bearing size is common in small electric motors, RC car and helicopter drivetrains, 3D printer extruders and filament guides, office equipment, and small rotary tools. If your old bearing reads 684ZZ or 684-ZZ, this is the direct replacement.
• 20 Pack — Outfit Multiple Projects in One Order: RC cars and micro drones use multiple 684ZZ bearings. 3D printer builds use them in extruders and motion components. With 20 in the pack, you are covered for a full build plus spares — or multiple small projects from one purchase.

Specifications

Common questions