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Engineers and maintenance professionals working in high-temperature, corrosive, or electrically sensitive environments know the frustration of steel bearings that seize, corrode, or conduct current at the worst possible moment. These silicon nitride full ceramic ball bearings with cage are engineered specifically for those demanding scenarios — delivering reliable rotation where conventional bearings fall short.
Each bearing is constructed entirely from silicon nitride (Si₃N₄) ceramic rolling elements and races, paired with a precision cage to maintain ball spacing and reduce friction. Available in a wide range of standard sizes from 603 (3×9×3 mm / 0.12"×0.35"×0.12") through 6906 (30×47×9 mm / 1.18"×1.85"×0.35"), covering 60x, 62x, 68x, and 69x series to suit diverse shaft and housing configurations.
Typical applications include food processing machinery requiring washdown-safe components, semiconductor fabrication equipment where electrical isolation is critical, chemical pumps and mixers exposed to aggressive media, and high-speed dental or medical handpieces that demand both precision and sterilization compatibility. These silicon nitride full ceramic ball bearings with cage also serve well in vacuum systems and cryogenic equipment where lubricant outgassing or freeze-up would compromise steel alternatives.
Silicon nitride retains structural integrity at sustained temperatures typically up to 800 °C (1,472 °F), far exceeding the limits of standard chrome steel or stainless steel bearings.
All-ceramic construction resists acids, alkalis, saltwater, and most industrial solvents — no rust, no surface degradation, no contamination of process media.
Silicon nitride is an electrical insulator, making these bearings essential for motors, generators, and equipment where stray currents cause pitting and premature failure in steel bearings.
Si₃N₄ is approximately 60% lighter than bearing steel with higher hardness (Vickers ~1,500 HV), enabling higher rotational speeds and reduced centrifugal loading on the outer race.
The integrated cage maintains uniform ball spacing, reduces noise and vibration, and prevents ball-to-ball contact — critical for smooth operation in precision instruments and high-speed spindles.
Covers 57 standard metric sizes across 60x, 62x, 68x, and 69x series (bore diameters 3–50 mm), allowing direct drop-in replacement or new design integration without custom machining.
| Material — Balls & Races | Silicon Nitride (Si₃N₄) ceramic |
|---|---|
| Cage Material | See variant options |
| Bearing Type | Full ceramic deep groove ball bearing with cage |
| Series Available | 60x, 62x, 68x, 69x (metric) |
| Bore Diameter (ID) Range | 3 mm – 50 mm (0.12" – 1.97") |
| Outer Diameter (OD) Range | 7 mm – 85 mm (0.28" – 3.35") |
| Width Range | 2 mm – 19 mm (0.08" – 0.75") |
| Specific Size (ID×OD×Width) | See variant options |
| Max Operating Temperature | Typically up to 800 °C (1,472 °F) |
| Hardness | Approx. 1,500 HV (Vickers) |
| Density | Approx. 3.2 g/cm³ |
| Electrical Conductivity | Non-conductive (insulating) |
| Lubrication | Dry-run capable; compatible with most greases and oils |
| Quantity per Order | 1 Pcs / 2 Pcs / 5 Pcs (see variant options) |
| Dimensional Standard | ISO metric |
Match the bore diameter (ID) to your shaft diameter, the outer diameter (OD) to your housing bore, and the width to your available axial space. All dimensions are listed in the variant selector in the format ID×OD×Width (mm). If you are replacing an existing bearing, the size code (e.g., 608, 6205) is usually stamped on the bearing face.
Silicon nitride (Si₃N₄) combines high fracture toughness with exceptional hardness and thermal shock resistance — properties that zirconia or alumina ceramics do not match simultaneously. This makes Si₃N₄ the preferred material for dynamic rolling contact applications where impact loads and thermal cycling occur.
Silicon nitride ceramic has inherently low friction and can operate dry for limited duty cycles, particularly in vacuum or clean-room environments where lubricant contamination is unacceptable. For continuous high-speed or high-load operation, a compatible grease or oil is still recommended to extend service life and reduce cage wear.
Yes. The all-ceramic construction is non-toxic, non-magnetic, and resistant to washdown chemicals including dilute acids and alkalis commonly used in food-grade cleaning protocols. They do not rust or shed metallic particles into process streams. For medical applications, verify sterilization compatibility (autoclave, EtO, or gamma) with your specific cage material.
Yes. Silicon nitride is an electrical insulator with very high resistivity. In variable-frequency drive (VFD) motors and generators, stray shaft currents cause electrical discharge machining (EDM) pitting in steel bearings. Full ceramic bearings break the current path entirely, eliminating this failure mode without requiring additional insulation sleeves.
Hybrid bearings use ceramic balls in steel races, offering improved speed and reduced weight over all-steel designs but retaining some corrosion and conductivity limitations from the steel races. Full ceramic bearings — like these — use ceramic for both balls and races, providing complete corrosion immunity, full electrical isolation, and the highest temperature resistance. Full ceramic is the correct choice when the operating environment attacks steel or when electrical isolation of the entire bearing is required.
Each size is available in packs of 1, 2, or 5 pieces. The 5-piece option provides a lower per-unit cost and is practical for maintenance stock or multi-axis machine builds. For larger volume requirements beyond the listed quantities, please contact us to confirm availability and pricing.
