623 ZZ Ultra-Thin Miniature Deep Groove Ball Bearing for Precision Instrument Components | 3×10×4 mm
The 623 ZZ is a Premium Ultra-Thin Miniature Deep Groove Ball Bearing engineered for applications demanding minimal axial space. Featuring double metal shields (ZZ) on both sides, this metric bearing provides effective protection against dust while maintaining an exceptionally slim profile. With a 3mm bore, it is ideal for micro-motors, compact mechanisms, optical devices, and other precision instruments where radial space is available but thickness is severely constrained.
623 ZZ Deep Groove Ball Bearing 3x10x4 mm | ISO 60 Series – Ultra Thin | Double Shielded
A specialized miniature precision bearing featuring the universal deep groove geometry. Designed for smooth operation at speeds up to 45,000 r/min (Oil). The 623 ZZ is capable of supporting light to moderate radial loads, making it a critical component for miniaturized electronics, fine mechanics, and high-speed tiny spindles.

Ideally suited for applications where space, particularly width, is the primary constraint:
The double, non-contact pressed steel shields offer reliable protection from both axial sides against dust and larger particles. This design is crucial for retaining lubrication in the bearing's compact internal space while contributing minimally to the overall thickness and rotational torque.
The defining feature of this bearing is its minimal width (4mm) relative to its bore and outer diameter, achieved by the 60 Series' extra-thin cross-section. This allows for integration into incredibly slim assemblies and devices where standard bearings cannot fit.
Manufactured to fine precision tolerances (up to P5 precision grades). Its optimized internal geometry ensures low friction and vibration, supporting stable and quiet rotation essential for sensitive applications like small fans, encoder discs, and precision pointing mechanisms.
| Bearing Type | Single Row Deep Groove Ball Bearing |
| ISO Dimension Series | 62 Series – Ultra Thin |
| Basic Designation | 623 |
| Suffix | ZZ (Both sides with steel shields) |
| Bore Diameter (d) | 3 mm |
| Outer Diameter (D) | 10 mm |
| Width (B) | 4 mm |
| Material (Races & Balls) | Chrome Steel (GCr15 / SAE 52100) |
| Precision Class | Standard / P5 Grade Available |
| Cage Material | Pressed Steel Ribbon |
| Dynamic Load Rating (Cʳ) | 1.08 kN |
| Static Load Rating (C₀ʳ) | 0.47 kN |
| Limiting Speed (Grease) | 36,000 r/min |
| Limiting Speed (Oil) | 45,000 r/min |
| Weight (approx.) | 1.8 g |
Direct replacement for:
The 623 ZZ is equipped with double pressed steel shields as standard. For applications requiring a higher degree of sealing, versions with rubber seals (623-2RS) are available, though they may slightly increase the frictional torque.
"For ultra-slim devices like miniature drones or high-speed micro spindles, the 623 ZZ provides the necessary performance in a minimal axial package."
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Details
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Details
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Details
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Details
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Details
The 6203-Z is a Single-Shielded Deep Groove Ball Bearing designed for reliable performance in light industrial equipment and drive systems. Featuring the standard deep groove raceway geometry, this bearing effectively accommodates moderate radial forces and light axial loads in both directions. With a 17 mm bore, 40 mm outer diameter, and 12 mm width, it provides a robust cross-section suitable for compact machinery housings. Equipped with a single metal shield (Z) on one side for contamination resistance while maintaining accessibility for re-lubrication, it is an excellent choice for applications requiring balanced protection and maintenance flexibility .
Details
The 6203-ZZ is a Double-Shielded Deep Groove Ball Bearing engineered for reliable performance in electric motors and general industrial applications. Featuring the standardized deep groove raceway geometry, this bearing efficiently accommodates moderate radial loads and bidirectional axial loads in space-constrained assemblies. With a 17 mm bore, 40 mm outer diameter, and 12 mm width, it offers a balanced cross-section suitable for various mechanical housings. Equipped with double metal shields (ZZ) for effective contamination resistance while maintaining low friction operation, it is an ideal choice for applications requiring extended service life with minimal maintenance intervention .
Details
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