7002 Angular Contact Ball Bearing (ZrO₂)

Angular Contact Ball Bearing (ZrO₂)-7002 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 7002. Dimensions in mm, weight in kg.

Mounting dimensions: da min = 17.5 mm, Da max = 29.5 mm, ra max = 0.3 mm.
   Reference weight: 0.024 kg (ZrO₂ full ceramic). This lightweight characteristic reduces centrifugal forces and energy consumption at high speeds.

◆ 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 (rings + balls) 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. Fixed contact angle provides directional load control and rigidity.
   ● Extreme Temperature Range – -200°C to +600°C (cage dependent). Low thermal expansion ensures stable clearances.
   ● Corrosion & Chemical Resistance – Resists acids, alkalis, solvents, seawater. FDA/USDA compliant grades available.
   ● High-Speed Capability – Lower density reduces centrifugal forces; speed up to 1.5× steel bearings.
   ● Wear & Friction – Low friction coefficient (0.05–0.12), excellent wear resistance.
   ● Electrical Insulation – Non-conductive, prevents arcing damage in motors/generators.

◆ Application Areas

   ● Precision High-Speed Spindles – Small CNC, PCB drilling, grinding spindles.
   ● Medical & Dental Equipment – Surgical handpieces, CT scanners, centrifuges. Biocompatible, lubrication-free.
   ● Semiconductor & Cleanroom – Vacuum robots, wafer handling – particle-free, non-magnetic.
   ● Chemical & Food Processing – Pumps, agitators, mixers – corrosion resistant, caustic washdown tolerant.
   ● Aerospace & Defense – Actuators, gyroscopes, flight controls – lightweight, extreme temperature reliability.
   ● Laboratory Instruments – Centrifuges, precision measurement equipment.

◆ Technical Data (typical)