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When a worn or undersized ball causes vibration, noise, or premature bearing failure, finding the exact replacement diameter is the difference between a quick fix and a costly downtime event. Machinists, maintenance engineers, and serious DIYers who work with industrial bearings, ball valves, and precision assemblies need rolling elements they can trust to spec — not approximate.
These bearing steel balls are manufactured from chrome steel (GCr15 / 52100 equivalent) and are available in a wide range of diameters from 30.163 mm (approx. 1.19") to 200 mm (approx. 7.87"), covering both metric and inch-series sizes. Each ball is ground and lapped to achieve a smooth, consistent spherical surface suited for load-bearing and rolling contact applications. Sold in quantities of 1, 3, or 5 pieces per order to match your exact replacement or project needs.
Typical use cases include replacing worn rolling elements in deep-groove ball bearings, angular contact bearings, and thrust bearings; seating in ball valves and check valves for fluid control systems; and serving as precision transfer balls in material handling fixtures, jigs, and tooling plates. The broad diameter range also makes these balls suitable for custom mechanical assemblies where standard off-the-shelf bearings are not available.
| Material | Chrome steel (GCr15 / AISI 52100 equivalent) |
|---|---|
| Diameter Range | 30.163 mm – 200 mm (approx. 1.19" – 7.87") |
| Available Sizes | See variant options (metric and inch-derived sizes) |
| Surface Finish | Ground and lapped spherical surface |
| Hardness | See variant options (typically 60–66 HRC for GCr15 chrome steel) |
| Grade / Tolerance | See variant options |
| Quantity per Order | 1, 3, or 5 pieces (select via Quantity option) |
| Application | Ball bearings, ball valves, check valves, transfer fixtures, precision assemblies |
| Corrosion Resistance | Standard chrome steel (not stainless); contact us to confirm for corrosive environments |
Check your bearing's part number against the manufacturer's datasheet, which lists the ball diameter and complement count. Alternatively, carefully remove one ball from the bearing and measure its diameter with a micrometer or digital caliper. Match that measurement to the closest available size in our variant list. For inch-series bearings, note that sizes like 31.75 mm (1-1/4"), 38.1 mm (1-1/2"), and 44.45 mm (1-3/4") correspond to standard fractional inch dimensions.
These balls are made from GCr15 chrome steel, which is equivalent to AISI 52100 — the most widely used alloy for bearing rolling elements. After heat treatment, GCr15 chrome steel typically achieves a hardness of 60–66 HRC, providing the wear resistance and fatigue strength required for rolling contact under load. This grade is not stainless steel; for corrosive or wet environments, please contact us to discuss material alternatives.
Yes. Chrome steel balls are commonly used as seating elements in ball valves and check valves in non-corrosive fluid systems. The ground and lapped surface finish provides the smooth, consistent spherical geometry needed for reliable sealing. For applications involving water, mild chemicals, or steam, verify that chrome steel is compatible with your media — stainless steel balls may be more appropriate for corrosive or food-grade environments.
In many cases, yes — if only one or a few balls are damaged, replacing the affected balls can restore bearing function. However, for critical or high-speed applications, it is generally recommended to replace the full ball complement at once to maintain uniform load distribution and avoid premature fatigue from mixed wear states. Always inspect the bearing races for scoring or pitting before reinstalling with new balls.
These decimal millimeter values are the metric equivalents of standard inch-series ball sizes. For example, 30.163 mm = 1-3/16", 34.925 mm = 1-3/8", and 39.688 mm = 1-9/16". Inch-series bearings manufactured to ABEC or RBEC standards use these fractional inch ball diameters, which when converted to millimeters produce the decimal values you see in the variant list. If you know your ball size in inches, multiply by 25.4 to find the equivalent millimeter size.
Order 1 piece if you need a single replacement ball for a spot repair or to verify fit before committing to a larger quantity. Order 3 pieces if you are replacing a partial complement or need a small spare stock. Order 5 pieces if you are replacing a full complement in a smaller bearing, running a batch repair on multiple units, or want to keep spares on hand for future maintenance. For larger quantities, please contact us directly.
Chrome steel balls are typically supplied with a light protective oil coating to prevent surface oxidation during storage and transit. Before installation in a bearing, wipe the balls clean with a lint-free cloth and apply the appropriate bearing grease or oil specified for your application. Do not install dry — even a thin film of lubricant significantly extends rolling element life by reducing metal-to-metal contact at the ball-race interface.
