Zirconia ZrO2 Ceramic Balls 9.5 mm is a zirconia (ZrO2) ceramic bearing ball with a stated diameter of 9.5 mm. It is a precision rolling element supplied as a component, not a complete bearing. Its suitability is governed by the ball diameter, grade and form accuracy together with the raceway geometry, clearance, lubrication and load conditions of the assembly in which it will run.
Rolling-Element Function and Accuracy
The ball provides the moving contact between mating raceways. Its 9.5 mm metric diameter establishes the nominal rolling-element size, but interchange also depends on the permitted diameter variation, sphericity and surface condition. A replacement selected only by nominal size can change internal clearance, contact stress and load sharing when the original ball set was graded more tightly.
This component lists grade 10, a diameter tolerance of ±0.25 μm, and a stated sphericity of 0.25μm. These controls describe different aspects of accuracy: nominal diameter sets the envelope, diameter variation affects matching within a set, and sphericity influences how evenly contact develops as the ball rolls. They should be considered together rather than treated as interchangeable labels.
Ceramic Material and Contact Behavior
For Zirconia ZrO2 Ceramic Balls 9.5 mm, the identified material is zirconia (ZrO2). Ceramic material selection affects elastic response, density, thermal expansion, thermal conductivity and compatibility with the raceway and lubricant. Those properties are relevant to acceleration, heat transfer and contact behavior, but the material name alone does not establish a permissible speed, temperature, load or service life for the finished bearing.
The listed material data include density 6.00 g/cm3, hardness 70 HRC, thermal-expansion coefficient 5.7 x 10–6/°F, and thermal conductivity 2 W/m-K @ 20° C. These values help compare the ball with candidate raceway and operating materials, especially where temperature gradients or rapid speed changes matter. They are material characteristics, not stand-alone guarantees of bearing friction, insulation, corrosion resistance or maximum operating temperature.
Integration into the Bearing Assembly
Assembly practice is critical for this 10 grade loose precision ball. Raceway cleanliness, handling and freedom from impact damage affect the contact surface presented after installation. Balls used as a matched set should not be mixed casually with elements of unknown diameter variation or grade, and the assembled clearance must be checked after the complete set and rings are selected.
Selection of Zirconia ZrO2 Ceramic Balls 9.5 mm should therefore verify nominal size, grade, tolerance, quantity and material against the complete bearing design. The engineer should also confirm raceway conformity, load direction, lubrication method, temperature range and the required clearance or preload. These assembly-level decisions determine whether the component can perform correctly; they are not properties supplied by the ball alone.
