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When standard steel balls fail under corrosive fluids, extreme temperatures, or high-speed rotation, engineers and maintenance professionals turn to silicon nitride ceramic balls. Grade 5 Si3N4 ceramic balls deliver the dimensional accuracy and surface finish required for precision bearing assemblies, pumps, and instrumentation where contamination or magnetic interference cannot be tolerated.
These Grade 5 silicon nitride (Si3N4) ceramic balls are manufactured to ABEC/ISO Grade 5 tolerances, covering diameters from 10 mm (0.394 in) to 38.1 mm (1.500 in) — including both metric and inch-series sizes such as 10.318 mm (13/32"), 12.7 mm (1/2"), 15.875 mm (5/8"), 19.05 mm (3/4"), 22.225 mm (7/8"), 25.4 mm (1"), 28.575 mm (1-1/8"), 31.75 mm (1-1/4"), and 38.1 mm (1-1/2"). Available in quantities of 1, 2, 3, 5, 8, or 10 pieces per order to suit both prototype and production needs.
Grade 5 Si3N4 ceramic balls are widely used as hybrid bearing rolling elements in CNC spindles and machine tool bearings where reduced centrifugal force extends spindle life, in chemical pump assemblies handling acids and alkalis where steel balls would corrode, and in MRI-adjacent or electromagnetic-sensitive equipment where non-magnetic rolling elements are required. The low density (approximately 3.2 g/cm³ vs. 7.8 g/cm³ for steel) also makes these balls a preferred choice for high-speed angular contact bearings targeting reduced heat generation.
| Material | Silicon Nitride (Si3N4) |
|---|---|
| Grade | Grade 5 (ISO 3290 / ABEC Grade 5) |
| Diameter Range | 10 mm – 38.1 mm (metric & inch series) |
| Hardness | See variant options |
| Density | ~3.2 g/cm³ |
| Surface Finish (Ra) | See variant options |
| Operating Temperature | See variant options |
| Magnetic Properties | Non-magnetic |
| Electrical Properties | Electrically insulating |
| Quantity Options | 1 / 2 / 3 / 5 / 8 / 10 PCS |
Grade 5 refers to the dimensional tolerance class per ISO 3290 / AFBMA standards. It specifies maximum allowable deviation in diameter, sphericity, and surface roughness. Grade 5 balls are suitable for precision bearing assemblies including angular contact, deep groove, and thrust bearings in demanding applications.
Yes. Silicon nitride ceramic balls are commonly used as drop-in replacements for steel balls in hybrid bearings, paired with standard steel or stainless steel inner and outer rings. This hybrid configuration reduces weight, heat, and wear compared to all-steel designs.
Match the ball diameter to your bearing's specified rolling element diameter. Both metric sizes (e.g., 10 mm, 12 mm, 15 mm, 16 mm, 20 mm, 25 mm, 30 mm) and inch-series sizes (e.g., 10.318 mm = 13/32", 12.7 mm = 1/2", 15.875 mm = 5/8", 19.05 mm = 3/4", 25.4 mm = 1") are available. Refer to your bearing manufacturer's datasheet for the correct ball diameter.
Yes. Si3N4 silicon nitride is chemically inert to most acids, alkalis, and saltwater solutions, making these balls suitable for pump impellers, chemical processing equipment, and marine applications where steel balls would corrode or contaminate the fluid.
Select the quantity that matches your bearing's ball complement or your replacement requirement. Options of 1, 2, 3, 5, 8, and 10 PCS are available. For full bearing rebuilds, consult your bearing's specification sheet for the number of rolling elements per row.
🛒 Select your Diameter(mm) and Quantity(PCS) above, then add to cart.
