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Engineers, machinists, and equipment builders who work in corrosive, high-temperature, or electrically sensitive environments know the frustration of steel balls that rust, magnetize, or contaminate sensitive media. Grade 10 Zirconia (ZrO2) ceramic ball bearings solve these problems with a material that resists chemical attack, conducts no electricity, and maintains dimensional stability across a wide temperature range.
Each ball is manufactured from zirconium dioxide (ZrO2) ceramic and finished to Grade 10 tolerances, meaning diameter variation is held within ±0.25 µm and surface roughness Ra ≤ 0.010 µm. The polished surface finish reduces friction and wear in both dry-running and lubricated assemblies. Diameters span 0.8 mm (≈ 0.031 in) to 25.4 mm (1.000 in), covering metric and inch series in a single catalog.
Typical applications include food-processing conveyor bearings where steel contamination is a compliance risk, semiconductor wafer-handling spindles that require non-magnetic and non-conductive rolling elements, medical device pivots and flow-control valves that must withstand repeated sterilization cycles, and high-speed dental or turbine handpieces where low mass and low friction extend service life.
| Material | Zirconium Dioxide (ZrO2) Ceramic |
|---|---|
| Grade | Grade 10 (per ISO 3290 / ABMA Std 10) |
| Surface Finish | Polished; Ra ≤ 0.010 µm |
| Diameter Range | 0.8 mm – 25.4 mm (0.031 in – 1.000 in) |
| Diameter Tolerance | ±0.25 µm (Grade 10) |
| Roundness Deviation | ≤ 0.25 µm |
| Density | Approx. 6.0 g/cm³ |
| Hardness | Approx. 1200 HV (Vickers) |
| Max. Continuous Service Temp. | Approx. 400 °C (752 °F) |
| Electrical Resistivity | > 10¹² Ω·cm (non-conductive) |
| Magnetic Permeability | Non-magnetic |
| Color | White / Ivory |
| Available Quantities | 1, 5, 10, 30, 100 pieces per order |
| Lubrication Requirement | See variant options (dry-run capable in many applications) |
Measure the existing steel ball with a micrometer or use the bearing manufacturer's part number to identify the nominal ball diameter. Match that dimension to the closest size in our variant list. For inch-series bearings, note that many fractional sizes (e.g., 3/16 in = 4.763 mm, 1/4 in = 6.35 mm, 5/16 in = 7.938 mm, 3/8 in = 9.525 mm, 7/16 in = 11.113 mm, 1/2 in = 12.7 mm, 9/16 in = 14.288 mm, 5/8 in = 15.875 mm, 11/16 in = 17.463 mm, 3/4 in = 19.05 mm, 1 in = 25.4 mm) are stocked as exact metric equivalents.
ZrO2 ceramic has a compressive strength exceeding 2000 MPa and hardness around 1200 HV, which is harder than most bearing steels. However, ceramic is more brittle than steel under impact or shock loads. These balls are well-suited for steady radial and axial loads in precision spindles, pumps, and flow-control valves, but are not recommended for applications with significant impact or vibration without engineering review.
Zirconia ceramic is chemically inert to most acids (including hydrochloric and sulfuric acid at moderate concentrations), alkalis, and salt solutions. It does not rust or oxidize. This makes it an excellent choice for marine hardware, food-processing equipment, chemical pumps, and medical devices that undergo repeated sterilization with steam, alcohol, or peroxide-based agents.
Yes. ZrO2 ceramic is fully non-magnetic (magnetic permeability ≈ 1.0) and will not be attracted to or disturbed by magnetic fields. It is also electrically non-conductive, which prevents eddy-current heating in high-frequency electromagnetic environments. These properties make it a standard choice for MRI-compatible instruments, semiconductor wafer handlers, and precision measurement equipment.
Ball grade refers to the dimensional precision class defined by ISO 3290 and ABMA Standard 10. Grade 10 specifies a maximum diameter variation of 0.25 µm and a maximum deviation from spherical form of 0.25 µm — tighter than Grade 25 (0.625 µm) or Grade 100 (2.5 µm). Grade 10 is appropriate for precision spindles, instrument bearings, and applications where low noise and minimal runout are required. For general-purpose use, Grade 25 may suffice; for ultra-precision optics or metrology, Grade 3 or Grade 5 would be considered.
ZrO2 ceramic can operate dry in many low-to-moderate speed applications because its hardness and smooth surface finish reduce adhesive wear. However, lubrication (grease or oil) is still recommended for high-speed or high-load conditions to reduce friction heat and extend service life. Avoid lubricants containing strong oxidizing agents. Consult your bearing manufacturer's guidelines when retrofitting an existing lubricated assembly.
Handle with clean, lint-free gloves or tweezers to avoid contaminating the polished surface with skin oils or particulates. Store in the original packaging or a clean, dry container away from hard metal objects that could chip the ceramic. Do not drop or impact the balls against hard surfaces. For cleanroom applications, balls can be cleaned with isopropyl alcohol and dried with filtered air before installation.
