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R144-ZZ Shielded Miniature Deep Groove Ball Bearing for Precision Applications | 3.175×6.35×2.779 mm

R144-ZZ Shielded Miniature Deep Groove Ball Bearing for Precision Applications | 3.175×6.35×2.779 mm

The R144-ZZ is a Double Metal Shielded Miniature Deep Groove Ball Bearing engineered for high-speed precision equipment where low friction and reliable operation are essential. Fitted with two non-contact metal shields (ZZ) on both sides, it provides effective protection against dust and larger particles while maintaining minimal torque and allowing high rotational speeds. With a 3.175 mm bore and ultra-compact cross-section, this bearing is ideal for small motors, instrumentation, robotics, and miniature drives operating in clean environments.

R144-ZZ Deep Groove Ball Bearing 3.175×6.35×2.779 mm | Inch Series – Miniature | Double Metal Shielded

This miniature bearing features a classic deep groove geometry, enabling exceptionally smooth and quiet operation at speeds reaching 50,000 r/min (Oil). It is designed to accommodate light radial loads and bidirectional axial loads in compact assemblies, making it a staple in precision engineering. The R144-ZZ stands as a versatile and reliable choice for applications where space constraints, high speeds, and basic contamination protection are critical to long-term performance.

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

Comprehensive Applications

Designed for precision and high-speed applications across various sectors where minimal space and low friction are paramount:

Precision Instruments & Automation
  • Miniature electric motors & stepping motors
  • Encoders, resolvers & servo drives
  • Robotics joints & miniature actuators
  • Laboratory equipment & analytical instruments
Office & Consumer Electronics
  • Hard disk drives & cooling fans
  • Printers, copiers & paper feed rollers
  • Optical drives & camera lens mechanisms
Medical & Dental Devices
  • Dental handpieces & surgical tools
  • Infusion pumps & portable medical devices
  • Laboratory centrifuges & mixers
Hobby & Model Engineering
  • RC car wheels & helicopter rotors
  • Model aircraft engines & servos
  • 3D printer components & linear motion systems

Key Performance Features

01. Precision-Grade Components for Smooth & Quiet Operation

Manufactured from high‑quality chrome steel with precision‑ground raceways and carefully controlled internal geometry, the R144‑ZZ delivers exceptionally low vibration and noise levels. It is available in ABEC‑1, ABEC‑5, or ABEC‑7 precision classes to match varying application requirements.

02. Ultra-Compact Design for Space-Constrained Applications

With dimensions of just 3.175×6.35×2.779 mm, the R144-ZZ offers a true miniature footprint without compromising load capacity. Its small form factor allows engineers to downsize assemblies while maintaining reliable performance in precision mechanisms.

03. High-Speed Capability with Metal Shields

The double metal shield (ZZ) configuration provides effective exclusion of larger contaminants while minimizing frictional torque. This design supports extremely high rotational speeds—up to 50,000 r/min with oil lubrication—making it ideal for high‑rpm miniature spindles and motors.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series R Series - Inch Series
Basic Designation R144
Suffix Options ZZ (Double Metal Shields)
Bore Diameter (d) 3.175 mm (1/8 inch)
Outer Diameter (D) 2.380 mm (0.0937 inch)
Width (B) 2.779 mm (0.1094 inch)
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100) or Stainless Steel (AISI 440C)
Precision Class ABEC‑1 (Standard), ABEC‑5/7 Available
Cage Material Ribbon Steel (Stamped)
Dynamic Load Rating (Cʳ) 0.38 kN
Static Load Rating (C₀ʳ) 0.13 kN
Limiting Speed (Grease) 40,000 r/min
Limiting Speed (Oil) 50,000 r/min
Weight (approx.) 0.5 g

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: R144‑ZZ
  • NSK: R144ZZ
  • FAG: R144‑ZZ
  • NTN: R144ZZ
  • KOYO: R144ZZ

Design & Configuration

The standard configuration for the R144‑ZZ includes double metal shields and factory‑applied grease suitable for moderate speeds. This design offers dependable protection for applications in relatively clean environments. For applications requiring enhanced sealing against moisture or fine dust, the rubber‑sealed version (R144‑2RS) is also available.

"Ideal for miniature motors, medical devices, and precision instrumentation, the R144‑ZZ ensures reliable high‑speed operation in compact spaces. Its low torque and smooth running characteristics are essential for maintaining performance and extending equipment life in demanding precision applications.”

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Request a Quote for Ball Bearings

Request a Quote for Ball Bearings
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