MR126-ZZ Miniature Deep Groove Ball Bearing For Precision Mechanisms | 6×12×4 Mm

The MR126-ZZ is an Ultra-Compact Double-Shielded Deep Groove Ball Bearing engineered for reliable performance in space-constrained precision applications. Featuring the standard deep groove raceway design, this miniature bearing efficiently handles radial loads and minimal axial loads from both directions. With a 6 mm bore and built-in double metal shields (ZZ), it provides essential protection while maintaining low friction, making it an ideal component for small electric motors, sensitive instruments, micro-drives, and other compact devices where smooth, maintenance-free operation is critical.



MR126-ZZ Deep Groove Ball Bearing 6x12x4 mm | Micro Series | Double Metal Shields (ZZ)

This widely utilized micro-series bearing features the universal deep groove raceway design. Engineered for quiet and precise high-speed operation up to 45,000 r/min (Grease), it delivers reliable radial load support within an extremely minimal footprint. The MR126-ZZ is a fundamental component for applications where space is at an absolute premium.

MR126-ZZ Miniature Deep Groove Ball Bearing For Precision Mechanisms | 6×12×4 Mm

Comprehensive Applications

Suited for ultra-compact precision equipment and micro-mechanisms:

Micro Motors & Miniature Drives
  • Small DC Motor Spindles

  • Micro Cooling Fan Motors
  • Stepper and Servo Motor Axles
  • Encoder and Sensor Rotations
Precision Instruments & Medical Devices
  • Dental Handpiece Drives
  • Optical and Laser Equipment
  • Laboratory Analyzer Mechanisms
  • Fine Adjustment Mechanisms
Consumer Electronics & Hobbyist Use
  • RC Model Car and Drone Motors

  • Small Appliance Actuators
  • Camera Autofocus Modules
  • 3D Printer Guide and Idler Pulleys
General Light-Duty Industrial
  • Textile Machine Tension Guides
  • Low-Load Conveyor Guides
  • Instrument Panel Controls
  • Valve and Solenoid Mechanisms

Key Performance Features

01. Ultra-Compact & Precision Built

The micro series design delivers reliable performance in an extremely small footprint with adequate radial load capacity for its size. Manufactured from high-carbon chrome steel, it ensures consistent operation and longevity in precision applications.

02. Integral Dual-Shield Protection

Features factory-installed double metal shields (ZZ) as standard, providing effective defense against dust and particulate ingress while maintaining very low rotational torque, ideal for maintenance-free, long-life designs.

03. Smooth High-Speed Capability

Produced to standard miniature bearing tolerances. The precision-ground raceways and balls ensure exceptionally smooth, low-vibration, and quiet rotation, enabling stable performance at high rotational speeds.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series MR Series – Micro Series
Basic Designation MR126
Suffix Double Metal Shield (ZZ)
Bore Diameter (d) 6 mm
Outer Diameter (D) 12 mm
Width (B) 4 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Stainless Steel or Pressed Steel
Dynamic Load Rating (Cʳ) 0.95 kN
Static Load Rating (C₀ʳ) 0.38 kN
Limiting Speed (Grease) 45,000 r/min
Limiting Speed (Oil) 56,000 r/min
Weight (approx.) 3 g

Interchange Part Numbers

Direct replacement for:

  • Generic: MR126ZZ
  • NSK: MR126ZZ

Design & Configuration

The MR126-ZZ is supplied as a grease-lubricated, pre-shielded micro bearing featuring double metal contact shields (ZZ). This configuration provides a maintenance-free, sealed-for-life solution with effective protection against dry particulates. For applications with specific sealing needs or requiring an open design, alternative configurations can be requested.

"The MR126-ZZ is a key choice for sensitive micro-motors, instruments, and ultra-compact mechanisms. Its standard ZZ shields deliver reliable, consistent performance in environments where controlling fine contamination is essential for longevity."



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