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7903 Angular Contact Ball Bearing (ZrO₂) is a high-precision full ceramic angular contact ball bearing. Made of yttria-stabilized zirconia (Y-TZP), it handles combined radial and axial loads with excellent corrosion resistance, high hardness, low friction, and complete electrical insulation. Suitable for extreme conditions including high temperature, vacuum, and chemically aggressive environments.
◆ Basic Dimensions and Weight
Model 7903. Dimensions in mm, weight in kg.
| Parameter | Value |
| Inner diameter (d) | 17 mm |
| Outer diameter (D) | 30 mm |
| Width (B) | 7 mm |
| Minimum fillet radius (r) | 0.3 mm |
| Minimum fillet radius (r1) | 0.15 mm |
Mounting dimensions: da min = 19.5 mm, Da max = 27.5 mm, ra max = 0.3 mm.
Reference weight: 0.013 kg (ZrO₂ full ceramic).
◆ Material and Design
Yttria-stabilized zirconia (ZrO₂, Y-TZP) – sintered advanced ceramic with ≥94% ZrO₂ + Y₂O₃ stabilizer. Density ~6.0 g/cm³, Vickers hardness 1250–1350 HV10, flexural strength ≥1000 MPa. Thermal expansion coefficient 10.3×10⁻⁶/K (matches steel), dielectric strength >15 kV/mm, non-magnetic, non-conductive. PTFE cage standard (up to ~260°C); PEEK cage optional (up to ~300–600°C). Full ceramic construction provides complete chemical inertness and allows dry running without lubricants.
◆ Core Performance Advantages
● Complex Load Capacity – 15°–40° contact angle handles radial + axial loads simultaneously.
● Extreme Temperature Range – -200°C to +600°C (cage dependent). Low thermal expansion ensures stable clearances.
● Corrosion & Chemical Resistance – Resists acids, alkalis, solvents, seawater.
● High-Speed Capability – Lower density reduces centrifugal forces; speed up to 1.5× steel bearings.
● Low Friction – Friction coefficient 0.05–0.12.
● Electrical Insulation – Non-conductive, prevents arcing damage.
◆ Application Areas
● Precision High-Speed Spindles – Small CNC, PCB drilling, grinding spindles.
● Medical & Dental Equipment – Surgical handpieces, CT scanners, centrifuges.
● Semiconductor & Cleanroom – Vacuum robots, wafer handling.
● Chemical & Food Processing – Pumps, agitators, mixers.
● Aerospace & Defense – Actuators, gyroscopes, flight controls.
● Laboratory Instruments – Centrifuges, precision measurement equipment.
◆ Technical Data
| Technical Data | |
| Temp. limit | -200°C to +600°C (cage dependent) |
| Friction coefficient (dry) | 0.05–0.12 |
| Thermal expansion coefficient | 10.3 × 10⁻⁶ /K |
| Dielectric strength | >15 kV/mm |
| Density | ~6.0 g/cm³ |
| Hardness | 1250–1350 HV10 |
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NO.23 JIAHE ROAD XIAMEN CHINA
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