684ZZ 미니어처 딥 그루브 볼 베어링 4x9x4mm (20팩), 이중 금속 차폐 크롬 스틸, 사전 윤활, 마이크로 모터, RC 모델, 3D 프린터 및 취미 프로젝트용

상품 특징

• Industrial & Scientific
• Power Transmission Products
• Bearings, Balls & Bushings
• Radial Ball Bearings
• Deep-Groove Ball Bearings
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• 684ZZ — 4x9x4mm Ultra-Miniature Bearing: 4mm inner bore x 9mm OD x 4mm width. Double metal shields (ZZ) on both sides. 20 bearings in the pack. One of the smallest standard bearing sizes — used in micro motors, RC cars, 3D printer extruders, and precision hobby mechanisms.
• Chrome Steel, Precision Ground, Pre-Lubricated: 100% GCr15 chrome steel — not carbon steel. Ground to tight tolerances for smooth, quiet rotation at the high RPMs typical of micro motors and RC drivetrains. Factory packed with grease — press in and go.
• Low Friction, Smooth Spin for Miniature Applications: Single-row deep groove design handles both radial and light axial loads. The precision-ground balls and raceways minimize friction and noise — matters when the bearing is spinning inside a micro motor at 30,000 RPM or an RC car differential.
• 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.