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MF Series
Home Deep Groove Ball Bearings MF Series

MF84-ZZ Flanged Miniature Ball Bearing for Micro-Mechanics & RC Models | 4×8×3 mm

MF84-ZZ Flanged Miniature Ball Bearing for Micro-Mechanics & RC Models | 4×8×3 mm

Engineered for highly compact assemblies requiring exact axial positioning, the MF84-ZZ is a premium miniature deep groove ball bearing featuring an integrated outer-ring flange. Outfitted with dual non-contact metallic shields (ZZ), it delivers exceptional defense against dust and debris while maintaining the factory-applied lubrication. Because the metal shields avoid physical friction with the inner ring, the MF84-ZZ ensures minimal startup torque and ultra-smooth rotation. This makes it an essential component for high-RPM, space-constrained 4mm bore applications, including precision RC vehicles, micro-stepper motors, and delicate optical instruments.

MF84-ZZ Deep Groove Ball Bearing 4x8x3 mm | High-Speed Design | Double Shielded

Manufactured to rigorous ISO precision standards, this flanged bearing simplifies housing designs by acting as a built-in locating stop. This unique architecture prevents the bearing from being pushed entirely through its mounting hole, securing the assembly under axial loads. The non-contact metal shields protect the micro-polished internal raceways without generating the heat typically associated with rubber seals. As a result, the MF84-ZZ can comfortably sustain tens of thousands of revolutions per minute, making it a maintenance-free powerhouse for automated miniature systems.

MF84-ZZ Flanged Miniature Ball Bearing for Micro-Mechanics & RC Models | 4×8×3 mm

Comprehensive Applications

Purpose-built for ultra-compact, high-velocity mechanical environments:

RC Vehicles & Hobbyist Tech
  • RC helicopter main shafts, tail rotors, and servos
  • 1/24 and 1/28 scale mini RC car drivetrains and differentials
  • Micro drone (whoop) high-speed brushless motors
  • Slot car axles and guide flags
Precision Instruments & Optics
  • Micro-gimbal camera stabilization motors
  • Laser scanning mirror mechanisms and LiDAR
  • Astronomical telescope tracking mounts
  • Small-scale rotary encoders and measuring tools
Micro-Motors & Robotics
  • Miniature stepper motors for desktop 3D printer extruders
  • Articulating joints in micro-robotics and surgical arms
  • Tiny cooling fans for compact electronics and laptops
  • Handheld precision dental and jewelers' tools
Office & Automation Equipment
  • Paper feed rollers in compact printers and scanners
  • Automated ATM and ticket dispensing micro-mechanisms
  • Fluid dispensing pumps in automated laboratory devices
  • Micro-actuators in smart home hardware

Key Performance Features

01. Ultra-Miniature Frictionless Geometry

With a micro 4mm bore and 8mm outer diameter, this bearing fits into the tightest mechanical spaces. The double pressed-steel shields (ZZ) provide robust particulate protection without the mechanical drag of contact seals, ensuring your micro-motors experience no parasitic power loss and battery life is maximized.

02. Premium Chrome Steel (GCr15)

Despite its tiny size, the MF84-ZZ is manufactured from ultra-clean, vacuum-degassed GCr15 chrome steel. Through precise heat treatment, the miniature balls and raceways achieve exceptional hardness and fatigue resistance, guaranteeing quiet, vibration-free operation even during rapid acceleration.

03. Integrated Locating Flange

The defining feature of the MF series is the extended flange on the outer ring (9.2mm diameter). This allows the bearing to be easily seated flush against a housing wall, providing perfect axial alignment and preventing the bearing from slipping through thin or delicate mounting brackets.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series Flanged Miniature Deep Groove Ball Bearing
Basic Designation MF84
Suffix ZZ (Double Steel Shields)
Bore Diameter (d) 4 mm
Outer Diameter (D) 8 mm
Width (B) 3 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Shield Material Pressed Steel
Dynamic Load Rating (Cʳ) 0.39 kN
Static Load Rating (C₀ʳ) 0.14 kN
Limiting Speed (Grease) 50,000 r/min
Limiting Speed (Oil) 60,000 r/min
Weight (approx.) 0.0006 kg (0.6 g)

Interchange Part Numbers

Directly replaces the following equivalent manufacturer part numbers:

  • EZO: F684ZZ / MF84ZZ
  • NSK: MF84ZZ
  • NMB: LF-840ZZ
  • KOYO: MF84ZZ
  • NTN: FL684ZZ

Design & Configuration

Out of the box, the standard MF84-ZZ is loaded with a high-performance, low-noise grease suited for high-speed miniature applications. Because flanged bearings are often used in specialized environments, we also offer this model in AISI 440C stainless steel for enhanced corrosion resistance in damp conditions. If your micro-assembly requires maximum defense against severe contamination rather than extreme RPMs, please ask our technical team about custom rubber-sealed options for miniature sizes.

"By combining a space-saving 4mm profile with a highly functional flanged outer ring, the MF84-ZZ solves complex mounting challenges in ultra-miniature engineering."

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MF84-ZZ Flanged Miniature Ball Bearing for Micro-Mechanics & RC Models | 4×8×3 mm

Engineered for highly compact assemblies requiring exact axial positioning, the MF84-ZZ is a premium miniature deep groove ball bearing featuring an integrated outer-ring flange. Outfitted with dual non-contact metallic shields (ZZ), it delivers exceptional defense against dust and debris while maintaining the factory-applied lubrication. Because the metal shields avoid physical friction with the inner ring, the MF84-ZZ ensures minimal startup torque and ultra-smooth rotation. This makes it an essential component for high-RPM, space-constrained 4mm bore applications, including precision RC vehicles, micro-stepper motors, and delicate optical instruments.

Details
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Developed for ultra-low profile mechanisms demanding flawless axial location, the MF52-ZZ stands as an elite-tier micro ball bearing engineered with an integrated outer-ring flange. Featuring dual non-contact steel shields (ZZ), it blocks environmental particulates effectively while keeping its pre-filled specialized grease intact. Since these metallic shields do not rub against the inner ring, frictional resistance and startup torque remain exceptionally low, paving the way for ultra-smooth rotation. This makes it an indispensable component for sub-miniature 2mm bore applications, including high-precision RC servos, medical equipment, and micro-stepper motors.

Details

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