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When a worn bearing seat, a seized linear rail, or a custom jig demands an exact replacement ball, finding the right diameter at the right tolerance can stall your entire project. These loose high-precision steel bearing balls are stocked in a wide diameter range — from 10.319 mm up to 30 mm — so hobbyists, machinists, and maintenance technicians can source exactly what they need without ordering a full bearing assembly.
Each ball is machined from solid carbon steel or chrome steel (depending on diameter variant) and finished to a smooth, consistent spherical surface. Diameters span 10.319 mm to 30 mm (approximately 0.406 in to 1.181 in), with many intermediate sizes including fractional-inch equivalents such as 20.638 mm (13/16 in), 21.431 mm (27/32 in), 22.225 mm (7/8 in), 23.813 mm (15/16 in), 24.606 mm (31/32 in), 25.4 mm (1 in), 28.575 mm (1-1/8 in). Quantities are available from 1 piece up to 50 pieces per order.
Typical applications include replacing loose balls in open-race radial bearings, filling custom ball-screw or linear-guide assemblies, use as transfer balls in material-handling fixtures, load-distribution balls in jigs and fixtures, and decorative or functional metalworking projects requiring a precision sphere.
| Material | Carbon steel / Chrome steel (varies by diameter) |
|---|---|
| Diameter Range | 10.319 mm – 30 mm (approx. 0.406 in – 1.181 in) |
| Available Diameters | 10.319, 10.5, 11.5, 11.906, 12.5, 13.5, 14.5, 15.5, 16.5, 17.5, 18.5, 19.5, 20, 20.5, 20.638, 21, 21.431, 22, 22.225, 23, 23.813, 24, 24.606, 25, 25.4, 26, 26.2, 27, 27.5, 28, 28.575, 29, 29.6, 30 mm |
| Quantity Options | 1, 3, 5, 8, 10, 20, 30, 50 PCS |
| Surface Finish | Smooth ground spherical surface |
| Hardness | See variant options |
| Tolerance Grade | See variant options |
| Application | Open-race bearings, linear guides, ball screws, jigs, fixtures, metalworking projects |
| Operating Environment | Dry or lightly lubricated; indoor and light-industrial use |
| Weight per Ball | See variant options |
Measure the inner diameter of your bearing race or housing using a caliper. Match that measurement to the listed diameter in the variant selector. For imperial bearings, use the fractional-inch equivalents listed in the product title — for example, 25.4 mm equals 1 inch and 28.575 mm equals 1-1/8 inch. If your measurement falls between two listed sizes, select the closest smaller diameter to avoid binding.
Yes. Each ball is machined from solid steel with no hollow core, providing consistent hardness and compressive strength throughout the sphere. They are suitable for radial and axial load applications in open-race bearings, ball screws, and linear guides operating under normal mechanical loads. For high-shock or extreme-load environments, confirm the specific hardness grade with us before ordering.
The steel construction offers inherent resistance to surface oxidation under dry or lightly lubricated indoor conditions. For applications involving moisture, water exposure, or corrosive chemicals, we recommend applying a light machine oil or grease after installation, or contacting us to discuss stainless steel alternatives if available for your required diameter.
Yes, provided you select the correct diameter. The listed sizes include both metric and fractional-inch equivalents that correspond to common bearing catalog standards. Always verify the required ball diameter from your bearing manufacturer's datasheet or by direct measurement of the existing balls before ordering.
Absolutely. Each variant is available in a 1 PCS quantity, making it straightforward to order a single replacement ball without purchasing a full set. Larger quantities (3, 5, 8, 10, 20, 30, or 50 PCS) are also available at progressively lower per-unit costs if you need spares or are stocking for ongoing maintenance.
If you need a one-time replacement, the 1 PCS or 3 PCS options are the most cost-effective for immediate needs. If you maintain equipment regularly or run a workshop where bearing replacements are routine, the 20, 30, or 50 PCS packs offer a lower per-ball cost and reduce reorder frequency. Compare the per-piece price across quantity tiers in the variant selector to find the best value for your usage pattern.
Some diameters are listed in exact metric millimeters (e.g., 20 mm, 25 mm, 30 mm) while others reflect fractional-inch conversions to metric (e.g., 20.638 mm = 13/16 in, 22.225 mm = 7/8 in, 25.4 mm = 1 in). The fractional-inch variants are designed to replace balls in bearings originally specified in imperial measurements. Both types are physically identical in construction — only the diameter differs.
