R144 Series Deep Groove Ball Bearing | Miniature 3.175mm Bore Design

• Small Cooling Fan Hubs (IT Equipment)
• Camera Module Auto-Focus Mechanisms
• Precision Timer and Gauge Movements
• Print Head Carriage Guides (Small Format Printers)
• Optical Disc Drive Lenses Actuators
• Scanner Mirror Motors

• Dental Handpiece Miniature Rotors
• Surgical Tool Articulation Points
• Lab Analyzer Sample Carousel Drives
• Micro Fluidic Pump Drives
• Handheld Diagnostic Device Motors
• Ophthalmology Instrument Drives

• Micro DC Motor Spindles
• Small Stepper Motor Rotors
• Coreless Motor Shafts
• Miniature Fan Motors
• Model and Hobby Motor Bearings
• Small Pump Impeller Drives

• Encoder and Resolver Rotor Supports
• Small Sensor Rotary Connections
• Robotics Miniature Joint Axles
• Precision Positioning Stage Guides
• Textile Guide Pulleys
• Gauging and Measurement Tool Spindles

01. Compact Design & Low Friction

With its extremely small dimensions and optimized internal geometry, the R144 minimizes space requirements and energy loss due to friction, enabling efficient operation in tightly constrained designs.

02. High Running Accuracy & Smoothness

Manufactured to fine tolerances, this bearing ensures low vibration and noise levels, contributing to the precise and smooth operation of sensitive miniature mechanisms.

03. Versatile & Reliable Performance

As a standard deep groove design, it accommodates radial loads and bidirectional axial loads, offering a versatile and reliable solution for a wide range of light-duty, high-speed miniature applications.

Interchange Part Numbers

Direct replacement for:

• Generic: R144, MR104ZZ (shielded equivalent)
• Metric Series: 626 (Close size: 6x19x6 mm, note R144 is inch-based)

Design & Configuration

The R144 is a standard open miniature bearing, allowing for direct application of grease or oil lubrication. It is most commonly used in high-speed, light-load scenarios where its compact size is critical. For applications requiring contamination protection, shielded versions (designated with a suffix like ZZ) of equivalent cross-section bearings are recommended.

"For the critical spindle support in miniature brushless DC motors or sensitive encoder mechanisms, the R144 provides the necessary precision and low-friction performance in an extremely compact package.”