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When a worn or undersized ball causes vibration, noise, or premature bearing failure, finding the exact replacement diameter quickly is critical. Engineers, maintenance technicians, and serious DIYers who work with linear slides, angular-contact bearings, ball screws, and custom jigs need a reliable source for precision-ground bearing steel balls across a wide size range — and that is exactly what these bearing steel ball bearings deliver.
Each ball is manufactured from through-hardened bearing steel (equivalent to AISI 52100 / GCr15 grade), offering a hardness of approximately 60–66 HRC and a surface finish typically within G10–G100 tolerance class. Diameters span from 1 mm (≈ 0.039 in) up to 80 mm (≈ 3.150 in), with both metric and inch-fractional sizes available. Pack quantities range from 1 piece to 500 pieces, letting you order exactly what a repair or production run requires.
Typical applications include replacing rolling elements in deep-groove ball bearings, angular-contact bearings, and thrust bearings; acting as check-ball valves in hydraulic and pneumatic circuits; serving as precision gauge balls for bore measurement; and functioning as load-transfer elements in custom fixtures, cam followers, and robotic end-effectors. The consistent sphericity and surface hardness also make these balls suitable for ball-burnishing tools used to work-harden and smooth bored surfaces.
Made from high-carbon chromium bearing steel (≈ AISI 52100 / GCr15), heat-treated to approximately 60–66 HRC for long fatigue life under cyclic radial and axial loads.
Wide Diameter Range: 1 mm – 80 mmOver 150 individual sizes covering metric steps and inch-fractional equivalents (e.g., 3.175 mm = 1/8 in, 6.35 mm = 1/4 in, 25.4 mm = 1 in), eliminating the need to source from multiple suppliers.
Precision Ground SphericityGround and lapped to tight roundness tolerances (typically G10–G100 class), ensuring smooth, low-noise rolling contact and consistent load distribution across the bearing raceway.
Corrosion-Resistant SurfaceThe dense, polished steel surface resists light oxidation in dry and lightly lubricated environments. For wet or chemically aggressive conditions, apply a compatible bearing grease or consider stainless alternatives.
Flexible Pack QuantitiesAvailable in packs of 1, 5, 10, 20, 25, 50, 100, 200, and 500 pieces — order a single replacement ball or stock up for production runs without paying for excess inventory.
Broad Application CompatibilitySuitable for deep-groove bearings, thrust bearings, ball screws, check valves, gauge balls, ball-burnishing tools, and custom mechanical assemblies requiring a hardened, precision spherical element.
| Material | High-carbon chromium bearing steel (≈ AISI 52100 / GCr15) |
|---|---|
| Hardness | Approximately 60–66 HRC (through-hardened) |
| Diameter Range | 1 mm – 80 mm (0.039 in – 3.150 in) |
| Size Increments | Metric and inch-fractional steps; see variant options |
| Tolerance Class | Typically G10–G100 (varies by diameter) |
| Surface Finish | Ground and lapped; smooth polished surface |
| Pack Sizes Available | 1, 5, 10, 20, 25, 50, 100, 200, 500 pcs |
| Typical Applications | Ball bearings, check valves, gauge balls, ball-burnishing tools, custom fixtures |
| Operating Temperature | See variant options |
| Lubrication | Compatible with standard bearing greases and oils |
Remove one ball from the bearing and measure its diameter with a micrometer or digital caliper. Match that measurement to the nearest size in the variant dropdown. For inch-fractional bearings, common sizes include 3.175 mm (1/8 in), 6.35 mm (1/4 in), 9.525 mm (3/8 in), 12.7 mm (1/2 in), 19.05 mm (3/4 in), and 25.4 mm (1 in). If your measurement falls between two listed sizes, contact us to confirm the correct grade.
These balls are manufactured from high-carbon chromium bearing steel equivalent to AISI 52100 (US) or GCr15 (ISO). This is the industry-standard alloy for rolling-element bearings, offering a good balance of hardness (≈ 60–66 HRC after heat treatment), fatigue strength, and wear resistance under cyclic loading.
Bearing steel (52100/GCr15) is not inherently stainless. In dry or lightly lubricated environments the polished surface resists light surface oxidation well. For applications involving water, cutting fluids, or corrosive chemicals, apply a compatible bearing grease as a barrier, or contact us about stainless steel ball options. Avoid prolonged exposure to moisture without lubrication.
Yes. Bearing steel balls are compatible with deep-groove, angular-contact, and thrust bearing designs. The key requirement is matching the ball diameter precisely to the bearing's ball complement specification. Verify the original ball diameter from the bearing manufacturer's datasheet or by direct measurement before ordering.
These balls are ground and lapped to a precision tolerance class typically in the G10–G100 range (per ISO 3290 / ABMA Std 10), depending on diameter. G10 is a tighter grade suitable for precision instruments and high-speed spindles, while G100 is appropriate for general industrial bearing replacement. If your application requires a specific certified grade, contact us to confirm availability for your chosen diameter.
It is strongly recommended to replace the entire ball complement — all balls in the bearing — rather than a single worn ball. Mixing new and used balls of slightly different diameters creates uneven load distribution, accelerates raceway wear, and increases noise and vibration. Count the balls in your bearing before ordering and select the appropriate pack size (1, 5, 10, 20, 25, 50, 100, 200, or 500 pcs).
Yes. Hardened bearing steel balls are widely used as check-ball valve elements in hydraulic and pneumatic circuits due to their precise sphericity, hardness, and resistance to deformation under pressure. Ensure the ball diameter matches the valve seat diameter specified by the valve manufacturer. For aggressive hydraulic fluids or high-temperature steam applications, verify chemical compatibility or consider stainless steel alternatives.
