MR74, MR74Z, MR74ZZ, MR74RS, MR74-2RS Miniature Deep Groove Ball Bearings 4x7x2.5mm – Precision Micro Bearings for Small Motors, Drones, RC Models & Smart Electronics

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MR74, MR74Z, MR74ZZ, MR74RS, MR74-2RS Miniature Deep Groove Ball Bearings 4x7x2.5mm – Precision Micro Bearings for Small Motors, Drones, RC Models & Smart Electronics

The MR74 series miniature deep groove ball bearings feature compact dimensions of 4mm (ID) × 7mm (OD) × 2.5mm (W), delivering smooth, quiet, and low-friction rotation in space-constrained applications. Ideal for small motors, mini drones, RC cars/airplanes, smart locks, wearable tech, cooling fans, and precision electronic devices.

Available in multiple sealing configurations to suit your operating environment:

MR74: Open type – minimal rotational resistance, perfect for clean or controlled settings
MR74Z / MR74ZZ: Single or double metal shields – reduce dust ingress while retaining factory grease
MR74RS / MR74-2RS: Single or double rubber seals – provide superior protection against moisture, dust, and fine contaminants

Manufactured from high-grade 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 instruments, and consumer electronics, the MR74 series balances miniaturization with mechanical durability.

🔧 Key Specifications:

Models: MR74, MR74Z, MR74ZZ, MR74RS, MR74-2RS
Dimensions: 4 × 7 × 2.5 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: Choose MR74-2RS for humid or dusty conditions; MR74ZZ for dry/dusty environments; open MR74 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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