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Ultra-Miniature Zirconia Ceramic Deep Groove Ball Bearing with AISI304 Stainless Steel Cage.
The CE-604-ZS-W9 is an ultra-miniature deep groove ball bearing featuring ZrO₂ (zirconia) rings and balls combined with an AISI304 stainless steel cage. With a compact envelope of 4×12×4 mm, this bearing is engineered for precision equipment where space is highly constrained. The integration of a metallic cage provides reliable ball guidance and structural integrity, making it a specialized solution for application-specific requirements.
| Parameter | Specification |
|---|---|
| Bearing No. | CE-604-ZS-W9 |
| Bearing Type | Deep Groove Ball Bearing (Full Ceramic, Ultra-Miniature) |
| Rings & Balls Material | ZrO₂ (Yttria-Stabilized Zirconia) |
| Cage Material | AISI304 Stainless Steel |
| Seal Type | ZS (Sealed, typically PTFE) |
| Bore Diameter (d) | 4 mm |
| Outside Diameter (D) | 12 mm |
| Width (B) | 4 mm |
| Chamfer Radius (r) | 0.2 mm |
| Mounting Dimension (da / Da / ra) | 5.6 mm / 10.4 mm / 0.2 mm |
| Reference Weight | 0.0017 kg (1.7 g) |
| Basic Dynamic Load Rating (Cr) | ~244.2 N (reference) |
| Basic Static Load Rating (C0r) | ~84 N (reference) |
| Maximum Speed (reference) | ~33,600 RPM |
| Temperature Range | -200°C to +180°C (seal/cage limit) |
The ultra-miniature 4×12×4 mm envelope makes it ideal for space-constrained precision devices, miniature motors, and compact instrumentation.
ZrO₂ rings and rolling elements deliver inherent electrical insulation, non-magnetic properties, and resistance to chemical corrosion.
Unlike standard polymer cages, the AISI304 metal cage provides enhanced structural rigidity and reliable ball guidance for demanding operational stability.
The integrated seals effectively retain internal lubricants (if applied) and block external contaminants, extending operational reliability.
● Precision Instruments — miniature measuring devices, optical scanners, and laboratory analytical equipment.
● Medical Device Components — micro-motors, dental handpieces, and surgical tool mechanisms.
● Semiconductor Equipment — wafer handling mechanisms and cleanroom robotics where non-magnetic parts are required.
● Miniature Motors & Spindles — micro-drilling equipment and high-speed compact drive systems.
TOJO BEARING COMPANY specializes in special-material bearing development. If the standard CE-604-ZS-W9 configuration does not perfectly match your equipment, our engineering team can evaluate and customize the following:
Cage Materials (e.g., PEEK, PTFE)
Internal Clearance & Tolerance
Lubrication (Dry or Grease)
Seal Types (Open, Shielded, Sealed)
Precision Grades (ABEC-3 / P6, etc.)
Special Dimensions
The -ZS indicates a sealed configuration, while W9 represents a specific tolerance or internal design code. Please provide your exact application requirements so TOJO can confirm the specific fit for your order.
While the ZrO₂ material itself can withstand up to +600°C, this specific bearing incorporates a sealed (ZS) design. The +180°C limit ensures the physical integrity of the seal material. For higher-temperature applications, TOJO can supply open or customized configurations.
Yes, the ZrO₂ ceramic rings and balls allow for dry running. However, if operating at maximum speeds or under heavier loads, a specialized high-speed grease or dry-film lubricant is recommended for optimal service life.
Send TOJO your operating conditions, clearance requirements, or environmental challenges. Our engineers will provide a technical evaluation and quotation within 24 hours.
Request a Technical Evaluation →
TOJO BEARING COMPANY — Our Bearings, Your Solutions.
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NO.23 JIAHE ROAD XIAMEN CHINA
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