1.0mm-2.80mm STEEL BALL BEARINGS G10 HIGH PRECISION Bearing Ball

Measure the existing ball with a micrometer or refer to your bearing's part number datasheet, which will list the ball diameter. Match that measurement to the available size options in the variant selector. If your assembly uses imperial sizing, note that 1.588mm equals 1/16 in and 2.381mm equals 3/32 in — both are available as dedicated variants.

G10 refers to ISO 3290 Grade 10, which specifies a maximum sphericity deviation of 0.25 µm and a diameter variation within a single lot of 0.25 µm. This grade is appropriate for precision instrument bearings, miniature radial bearings, and ball-screw assemblies where tight dimensional control is required. For ultra-high-speed spindle bearings or aerospace-critical applications, G3 or G5 may be specified instead — confirm your design requirement before ordering.

These are bearing-grade steel balls with a polished surface that provides moderate resistance to oxidation under normal indoor conditions. They are not stainless steel. For applications involving water, cutting fluids, or high-humidity environments, consider stainless steel (AISI 440C) grade balls instead. If used in lightly lubricated assemblies, a compatible bearing grease or oil will extend service life and reduce surface oxidation risk.

Yes, provided the diameter matches the original ball specification exactly. Miniature bearings are sensitive to ball diameter — even a 1–2 µm deviation can affect preload and noise. Use a micrometer to verify the original ball diameter before selecting a replacement. G10 grade is compatible with most standard miniature bearing applications.

For a single bearing repair or prototype build, the 20 or 50 piece packs are typically sufficient — most miniature bearings contain between 5 and 15 balls per row. For production restocking or batch assembly work, the 500, 1,000, or 5,000 piece packs offer a lower per-unit cost. Select the pack size that matches your expected consumption over a 3–6 month period to balance cost and storage.

Store in a clean, dry environment away from direct moisture, solvents, and abrasive dust. Keep balls in their original sealed packaging until use. Avoid mixing different diameter balls in the same container, as contact between balls of different sizes can cause surface scratching that degrades sphericity. For long-term storage, a light coating of clean bearing oil is recommended.

Yes. Two fractional-inch equivalents are included in the size range: 1.588mm corresponds to 1/16 inch, and 2.381mm corresponds to 3/32 inch. These are common sizes in imperial-standard miniature bearings used in North American and UK-designed instruments and mechanisms. Select the variant that matches your required nominal diameter.