Description

The EZO 623-2Z is a high-precision miniature deep groove ball bearing designed for small-scale applications requiring low friction, smooth rotation, and long service life. Manufactured by EZO Bearings (Sapporo Precision Inc.), a renowned Japanese company known for producing world-class miniature and small-diameter bearings, the 623-2Z is trusted for its performance and reliability in tight, high-precision assemblies.

This specific bearing model features metal shields on both sides — designated by the “2Z” suffix — which protect the internal ball-and-raceway structure from contaminants like dust and debris. These non-contact shields ensure that the bearing retains its pre-lubricated grease and operates efficiently in clean to moderately contaminated environments. The shields are securely mounted into grooves in the outer ring and are designed not to touch the inner ring, ensuring low friction and high-speed capability.

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Key Specifications:

• Bearing Type: Deep Groove Ball Bearing

• Model: EZO 623-2Z

• Inner Diameter (Bore): 3 mm

• Outer Diameter: 10 mm

• Width (Thickness): 4 mm

• Sealing: Double metal shields (2Z)

• Weight: Approximately 1.1 grams

• Material: High-grade chrome steel (AISI 52100 equivalent)

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Design and Performance

The deep groove raceway design allows the EZO 623-2Z to support both radial loads and limited axial loads in either direction. Despite its small size, the bearing is capable of operating at very high rotational speeds with minimal friction. The hardened steel balls and raceways are finely machined to tight tolerances, ensuring smooth rolling motion and low vibration, even at elevated speeds.

The metal shields provide protection while allowing for free movement of internal components. Unlike rubber seals (e.g., 2RS types), these shields are non-contact, which makes the 623-2Z especially suited for applications where speed and low resistance are essential.

Because of its miniature dimensions, the EZO 623-2Z is ideal for compact assemblies and precision equipment where space and weight are critical. It is commonly used in:

• Miniature motors and gearboxes

• Precision instruments and lab equipment

• Robotics and mechatronics

• Dental and medical devices

• RC models and micro-drones

• Computer peripherals and small fans

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Construction and Materials

The bearing is made from AISI 52100 chrome steel, a high-carbon chromium alloy known for its excellent wear resistance, hardness, and dimensional stability. This ensures a long operating life and high resistance to fatigue under continuous use.

The internal components are lubricated with high-quality grease, sealed inside during manufacturing. This means the 623-2Z is a maintenance-free solution for most use cases, especially in environments where frequent servicing is impractical.

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Easy Installation and Interchangeability

The EZO 623-2Z conforms to ISO and JIS standards, making it fully interchangeable with equivalent models from brands such as SKF, NSK, NTN, and FAG. Its precise sizing and consistent build quality ensure easy integration into existing assemblies or replacement applications without modification.

The small size and lightweight nature (approximately 1.1 grams) also make this bearing suitable for moving components in portable or weight-sensitive designs. It can be press-fit into place or mounted using light adhesives or retaining clips, depending on the application.

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Why Choose EZO?

EZO Bearings are known for their ultra-precise manufacturing standards, especially in miniature and small-diameter ranges. The company specializes in high-performance bearings for demanding environments, including aerospace, medical, and laboratory equipment. Choosing EZO means you’re investing in Japanese engineering precision, smooth operation, and long-lasting performance — even at micro-scale dimensions.

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Summary

The EZO 623-2Z is a high-precision, miniature deep groove ball bearing designed for compact, high-speed, and low-friction applications. With dimensions of 3×10×4 mm, dual metal shields, and a weight of just 1.1 grams, it delivers reliable, quiet, and efficient performance in robotics, motors, and miniature machinery. Whether you’re an OEM or a hobbyist, the 623-2Z provides outstanding value and world-class reliability from one of the most respected names in miniature bearing technology.

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