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MR Series
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MR149 Metric Series Miniature Ball Bearing | Slim-Section Precision | 9×14×3 mm

MR149 Metric Series Miniature Ball Bearing | Slim-Section Precision | 9×14×3 mm

The MR149 is a high-performance, metric-series miniature deep groove ball bearing specifically engineered for applications requiring a large bore-to-outside-diameter ratio in a slim-section profile. With a 9mm inner diameter and a narrow 3mm width, this bearing offers a unique solution for rotating components that need to pass over larger shafts without increasing the overall housing volume. Whether configured as open or shielded, the MR149 provides exceptionally low starting torque and high-speed stability, making it a cornerstone for modern mechatronics and precision hardware.

MR149 Miniature Deep Groove Ball Bearing 9×14×3 mm | Dynamic Speed & Space Efficiency

Designed for systems where axial space is at a premium, the MR149 excels in high-RPM environments where radial accuracy is paramount. This thin-section miniature bearing is optimized to handle moderate radial and thrust loads while maintaining a minimal footprint. Its refined internal raceway finish reduces internal friction and heat generation, ensuring consistent performance in high-frequency oscillation or continuous high-speed rotation.

MR149 Metric Series Miniature Ball Bearing | Slim-Section Precision | 9×14×3 mm

Comprehensive Applications

Engineered for designers and OEMs who demand reliable performance in specialized miniature mechanical assemblies:

High-Performance Electronics
  • Brushless DC (BLDC) Motor Support
  • Cooling Fans for High-End Servers
  • Precision Rotary Encoders
  • Sub-Miniature Spindle Drives
Robotics & Modern Automation
  • Micro-Robot Articulated Joints
  • Small-Scale Gimbal Stabilizers
  • Precision Stepper Motor Shafts
  • Automated Material Handling Sensors
Hobby & Professional RC Systems
  • High-Speed Outrunner Motors
  • Remote Controlled Car Transmissions
  • FPV Drone Propeller Hubs
  • Scale Model Jet Engine Components
Scientific & Medical Devices
  • Laboratory Mixing Equipment
  • Compact Diagnostic Imaging Hardware
  • Handheld Precision Measurement Tools
  • Surgical Robotic Tool Interfaces

Key Performance Features

01. Optimized Thin-Section Geometry

The MR149 features a specialized "thin-section" design, allowing for a relatively large 9mm bore within a compact 14mm housing. This geometry is ideal for hollow-shaft applications or designs requiring high stiffness and low mass, providing engineers with greater flexibility in space-constrained layouts.

02. High-Hardness GCr15 Chrome Steel

Utilizing premium SAE 52100 (GCr15) Chrome Steel, the rings and balls are heat-treated to achieve optimal fatigue resistance. This high-grade material ensures that the MR149 maintains its geometric integrity and ABEC-3 to ABEC-5 precision ratings even under prolonged high-speed operation.

03. Customizable Sealing & Lubrication

Available in Open, Shielded (ZZ), or Sealed (2RS) configurations, the MR149 can be tailored to your specific environment. We offer a variety of lubrication options, from ultra-light high-speed oils for low-torque instruments to heavy-duty synthetic greases for applications requiring long-term maintenance-free life.

Technical Specifications

Bearing Type Miniature Deep Groove Ball Bearing
ISO Dimension Series Metric MR Series
Basic Designation MR149
Suffix Options Open, ZZ (Shielded), 2RS (Sealed)
Bore Diameter (d) 9 mm
Outer Diameter (D) 14 mm
Width (B) 3 mm
Material (Races & Balls) High-Carbon Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material High-Carbon Chrome Steel (GCr15 / SAE 52100)
Dynamic Load Rating (Cʳ) Approx. 550 N
Static Load Rating (C₀ʳ) Approx. 310 N
Limiting Speed (Grease) 40,000 RPM
Limiting Speed (Oil) 48,000 RPM
Weight (approx.) 1.30 grams

Interchange Part Numbers

Cross-reference these industry-standard part numbers for easy procurement:

  • NMB: L-1490
  • SKF: MR149
  • NSK: MR149
  • NTN: MR149
  • KOYO: MR149

Design & Configuration

Drawing on 15 years of precision manufacturing excellence, Welink Bearing delivers world-class micro-rotational solutions. The MR149 is built for high-speed reliability and integration ease. For our industrial partners, we provide comprehensive technical support, including customized radial internal clearance (CN, C3) and specialized grease-fill percentages to ensure the bearing performs perfectly within your specific operational parameters.

"Integrate the MR149 into your next precision project—where thin-section efficiency meets high-speed metric accuracy.”

Download Product Catalog (PDF)

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MR149 Metric Series Miniature Ball Bearing | Slim-Section Precision | 9×14×3 mm

The MR149 is a high-performance, metric-series miniature deep groove ball bearing specifically engineered for applications requiring a large bore-to-outside-diameter ratio in a slim-section profile. With a 9mm inner diameter and a narrow 3mm width, this bearing offers a unique solution for rotating components that need to pass over larger shafts without increasing the overall housing volume. Whether configured as open or shielded, the MR149 provides exceptionally low starting torque and high-speed stability, making it a cornerstone for modern mechatronics and precision hardware.

Details

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