7300 Angular Contact Ball Bearing (ZrO₂)

7300 Angular Contact Ball Bearing (ZrO₂) is a high-precision zirconia ceramic angular contact ball bearing made of yttrium-stabilized zirconia, suitable for extreme conditions. Compared to 7000 series, 7300 has larger outer diameter (35mm vs 26mm) and width (11mm vs 8mm), providing higher radial load capacity and rigidity for medium-heavy duty applications.

7300 vs 7000 – Key Differences:
       • OD +35% (26→35mm) → larger load area.
       • Width +37.5% (8→11mm) → higher stiffness.
       • Weight 0.04kg (7000: 0.014kg) – stronger yet lightweight.
       • Fits larger housings → ideal for industrial robots, chemical pumps, mining conveyors.

I. Basic Dimensions & Weight

Model 7300. Dimensions in mm, weight in kg.

Reference weight: 0.04kg.

II. Core Performance Advantages

● Complex Load Capacity: Contact angle 15°–40° handles radial/axial loads. 7300 offers higher Cr/Cor than 7000.

● Extreme Temperature: -200°C to +600°C, low thermal expansion, vacuum compatible (lubrication-free).

● High Speed: 1.5x steel bearings speed. Low friction reduces heat.

● Material Properties: Yttria-stabilized ZrO₂ – high hardness, corrosion/wear resistant, electrically insulating, lightweight.

● High Precision: P4/P5 grade available, smooth and stable operation.

III. Core Application Areas

● Industrial Robots: Joints and actuators – insulation, corrosion resistance, combined loads.

● Chemical Pumps: Magnetic drive pumps, agitators – withstands acids/alkalis, no lubrication needed.

● Mining Machinery: Conveyors, screens, crushers – high hardness and toughness in abrasive conditions.

● High-Speed Spindles: CNC machines (30k–60k rpm) – reduced heat, higher acceleration, supports heavier tooling.

● Aerospace & Medical: Extreme temps, higher load margins (actuators, surgical tools).

Overall, 7300 zirconia angular contact ball bearing is a precision component for extreme conditions with enhanced load capacity over 7000 series, overcoming steel bearings' limitations in temperature, corrosion, speed, and electrical insulation.