MR84, MR84Z, MR84ZZ, MR84RS, MR84-2RS Miniature Deep Groove Ball Bearings 4x8x3mm – Precision Micro Bearings for Small Motors, Drones, RC Models & Smart Electronics

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MR84, MR84Z, MR84ZZ, MR84RS, MR84-2RS Miniature Deep Groove Ball Bearings 4x8x3mm – Precision Micro Bearings for Small Motors, Drones, RC Models & Smart Electronics

The MR84 series miniature deep groove ball bearings feature compact dimensions of 4mm (ID) × 8mm (OD) × 3mm (W), delivering smooth, quiet, and low-friction rotation in space-limited applications. Ideal for small motors, mini drones, RC cars/airplanes, smart locks, wearable tech, cooling fans, and precision electronic instruments.

Available in multiple sealing configurations to match your operating environment:

MR84: Open type – minimal drag, best for clean or controlled settings
MR84Z / MR84ZZ: Single or double metal shields – reduce dust ingress while retaining factory grease
MR84RS / MR84-2RS: Single or double rubber seals – provide enhanced protection against moisture, dust, and fine contaminants

Manufactured from high-quality stainless steel (AISI 440C) as standard—offering excellent corrosion resistance—or chrome steel upon request. These micro bearings ensure high rotational accuracy, low noise, and reliable performance even at elevated speeds.

Commonly used in brushless DC (BLDC) motors, FPV drone gimbals, tiny gearboxes, robotics joints, medical micro-tools, and consumer electronics, the MR84 series strikes an ideal balance between miniaturization and mechanical robustness.

🔧 Key Specifications:

Models: MR84, MR84Z, MR84ZZ, MR84RS, MR84-2RS
Dimensions: 4 × 8 × 3 mm
Material: Stainless Steel (standard); Chrome Steel optional
Precision Grade: ABEC-1 to ABEC-7 available
Ideal for: Small motors, drones, RC models, smart gadgets, and precision mechanisms

⚠️ Tip: Use MR84-2RS in humid or dusty conditions; MR84ZZ for dry/dusty environments; open MR84 for ultra-high-speed or cleanroom applications.

Each bearing undergoes strict quality inspection and is packaged in anti-static containers. Available in single units or bulk packs — contact us for OEM or wholesale orders!

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