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When a worn or pitted bearing ball causes rough rolling, wobble, or premature wear in your wheel hub, skateboard, or mechanical assembly, finding the exact replacement diameter is the difference between a smooth fix and a wasted afternoon. These solid bearing steel balls are stocked in an extensive range of diameters — from 1.0mm up to 9.525mm — so DIYers, cyclists, and maintenance technicians can match the spec they need without compromise.
Each ball is manufactured from hardened bearing steel (chrome steel, typically AISI 52100 equivalent), delivering the hardness and surface finish required for rolling-contact applications. Diameters span 1.0mm to 9.525mm (approximately 0.039 in to 0.375 in), with many intermediate sizes available to cover both metric and inch-based bearing standards. Packing quantities range from 30 to 1000 pieces per order to suit single-repair jobs through to workshop bulk stock.
Typical use cases include bicycle hub bearing replacement, skateboard and inline skate bearing service, small electric motor bearing maintenance, and precision instrument repair — all scenarios where sourcing the correct solid ball bearing diameter is critical to restoring smooth, low-friction operation.
| Material | Hardened bearing steel (chrome steel, AISI 52100 equivalent) |
|---|---|
| Diameter Range | 1.0mm – 9.525mm (approx. 0.039 in – 0.375 in) |
| Surface Finish | Polished, smooth rolling surface |
| Ball Type | Solid (not hollow) |
| Packing Quantity | See variant options (30 / 50 / 100 / 500 / 1000 pcs) |
| Diameter (selected) | See variant options |
| Hardness | See variant options |
| Grade / Tolerance Class | Contact us to confirm |
| Application | Bicycle hubs, skateboards, inline skates, small motors, precision instruments |
Use a digital micrometer or vernier caliper to measure the diameter of an existing ball removed from the bearing race. Measure across the widest point. For bicycle hubs, the ball size is often stamped on the cone or listed in the bike manufacturer's service manual. When in doubt, measure — do not estimate by eye, as a 0.1mm difference can affect rolling performance.
Yes. These balls are made from hardened chrome bearing steel, the same material class used in standard bicycle bearing assemblies. They are designed to handle the radial and axial loads typical of hub, headset, and bottom bracket applications under normal cycling conditions.
Chrome steel bearing balls have inherent corrosion resistance due to their chromium content, but they are not stainless steel. For applications with regular water exposure — such as mountain biking in wet conditions — apply bearing grease after installation and re-grease periodically. For fully waterproof requirements, consider stainless steel bearing balls instead.
Yes, provided you select the correct diameter to match your bearing race. Most standard skateboard bearings use 608-type cartridge bearings with 6mm balls, while inline skate bearings vary. Measure your existing balls or consult your bearing's specification sheet before ordering.
A typical bicycle hub uses 9–11 balls per side, so a pack of 30 covers one full hub service with spares. For a full bike overhaul (hubs, headset, bottom bracket), a pack of 100 is practical. Workshops or frequent repair users benefit from 500 or 1000-piece packs for bulk stock at a lower per-unit cost.
These are loose, individual solid bearing balls intended for open bearing races — the type found in traditional cup-and-cone bicycle hubs, headsets, and bottom brackets. They are not pre-assembled in a cage or cartridge. If your application uses sealed cartridge bearings (e.g., most modern skateboard bearings), you need a complete cartridge replacement, not loose balls.
