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When a worn or damaged bearing ball causes vibration, noise, or premature failure in your machinery, finding an exact replacement in the right diameter is critical. These solid loose bearing balls are designed for makers, repair technicians, and engineers who need a reliable, dimensionally accurate steel ball in a specific size — without ordering a full bearing assembly.
Each ball is machined from carbon steel or chrome steel (material varies by diameter; see variant options for confirmation), ground and polished to a smooth finish. Diameter range spans 1mm (~0.039 in) to 130mm (~5.118 in), covering both metric and fractional inch sizes. Balls are sold individually or in packs of 10 or 100 depending on the selected diameter and quantity variant.
Typical use cases include replacing loose balls in open or shielded radial bearings for bicycle bottom brackets and headsets, restoring ball-type linear slides and drawer runners, and sourcing precision balls for DIY jigs, gauges, valve seats, and cam follower assemblies where a specific diameter is required.
Available from 1mm to 130mm, including fractional inch equivalents (e.g., 3.175mm = 1/8", 6.35mm = 1/4", 25.4mm = 1"), making it straightforward to match both metric and imperial bearing specifications.
Each ball is solid steel throughout — no hollow core — providing consistent mass, load distribution, and dimensional stability under radial and axial loads.
Balls are precision-ground and polished to reduce surface roughness, enabling low-friction rolling contact and quiet operation in bearing races and guide channels.
The polished steel surface resists light oxidation in typical indoor and light-industrial environments. For wet or chemically aggressive environments, confirm material grade before use.
Smaller diameters (up to ~16mm) are available in packs of 100 or 10 pieces; larger diameters are available individually. Select the quantity that matches your repair or project volume.
Diameter options include common bearing ball standards (e.g., 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4", 7/8", 1", 1-1/2", 2", 3", 4", 5") alongside metric sizes, simplifying cross-reference to bearing manufacturer catalogs.
| Product Type | Solid Loose Bearing Ball |
|---|---|
| Material | See variant options |
| Finish | Precision-ground, polished |
| Diameter Range | 1mm – 130mm (approx. 0.039" – 5.118") |
| Diameter Tolerance | See variant options |
| Surface Roughness | See variant options |
| Hardness | See variant options |
| Pack Quantity | 1 Pcs / 10 Pcs / 100 Pcs (see variant options) |
| Application | Radial bearings, linear guides, valve seats, precision assemblies |
| Shape | Spherical (solid) |
Remove one of the existing balls from your bearing and measure its diameter with a digital caliper. Match that measurement to the closest diameter listed in the variant options. For fractional inch bearings, common equivalents are: 3.175mm = 1/8", 4.763mm = 3/16", 6.35mm = 1/4", 7.938mm = 5/16", 9.525mm = 3/8", 11.113mm = 7/16", 12.7mm = 1/2", 14.288mm = 9/16", 15.875mm = 5/8", 19.05mm = 3/4", 22.225mm = 7/8", 25.4mm = 1".
The balls are manufactured from steel. Specific grade (carbon steel or chrome steel) varies by diameter. If your application requires a confirmed material grade or hardness specification, please contact us before ordering so we can verify the exact material for your selected size.
These balls are suitable for general-purpose and light-to-medium industrial applications including bicycle components, drawer slides, valve seats, and DIY machinery. For critical high-speed or high-load applications requiring certified grade (e.g., Grade 10 or Grade 25 per ABMA/ISO standards), please contact us to confirm the grade available for your diameter.
The polished steel surface provides moderate resistance to light oxidation in dry or lightly humid indoor environments. They are not stainless steel. For applications exposed to water, moisture, or chemicals, consider applying a light lubricant or grease, or contact us to inquire about stainless steel ball availability for your required diameter.
Yes, provided you can access the bearing race to replace individual balls. These loose balls are commonly used to restore open bearings and bearings where the shield or seal can be removed. Measure the existing balls carefully before ordering, as even a 0.1mm difference in diameter can affect bearing preload and performance.
The quantity options available depend on the diameter selected. Smaller diameters (typically up to ~16mm) are available in packs of 100 or 10 pieces, which suits bearing rebuilds requiring multiple balls per race. Larger diameters are available individually, as a single ball is typically sufficient for most repair or prototype applications at those sizes. Select the quantity that matches your project needs.
Dimensional tolerance varies by diameter and is not uniformly specified across all sizes in this listing. If your application requires a specific tolerance class (e.g., Grade G10, G25, G100 per ISO 3290), please contact us with your required diameter and tolerance class before ordering.
