• Miniature electric motors & stepping motors
• Encoders, resolvers & servo drives
• Robotics joints & miniature actuators
• Laboratory equipment & analytical instruments

• Hard disk drives & cooling fans
• Printers, copiers & paper feed rollers
• Optical drives & camera lens mechanisms

• Dental handpieces & surgical tools
• Infusion pumps & portable medical devices
• Laboratory centrifuges & mixers

• RC car wheels & helicopter rotors
• Model aircraft engines & servos
• 3D printer components & linear motion systems

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.

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.”