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When a worn or undersized ball causes vibration, premature bearing failure, or unacceptable runout in your machinery, the root cause is almost always dimensional inconsistency. Engineers, maintenance technicians, and precision equipment builders who need a reliable replacement or upgrade turn to G10 grade Gcr15 bearing steel balls for their tight sphericity tolerances and consistent surface finish.
These bearing steel balls are manufactured from Gcr15 (equivalent to AISI 52100) high-carbon chromium steel, delivering a hardness of approximately 60–66 HRC after heat treatment. Available in diameters from 29 mm (approx. 1.14 in) to 100 mm (approx. 3.94 in), each ball meets G10 grade tolerances — a sphericity deviation of no more than 0.25 µm — making them suitable for precision spindles, ball screws, and load-bearing assemblies.
Typical use cases include replacement rolling elements in deep-groove ball bearings and angular contact bearings, load transfer balls in linear motion guides and ball screws, and precision check valves or metering applications in hydraulic and pneumatic systems where consistent diameter is critical to sealing performance.
Sphericity deviation ≤ 0.25 µm and diameter tolerance within ±0.25 µm, meeting ABMA / ISO G10 standards for precision rolling elements.
Gcr15 (AISI 52100 equivalent) provides a through-hardened structure with hardness of approximately 60–66 HRC, resisting deformation under heavy radial and axial loads.
Available from 29 mm to 100 mm (approx. 1.14 in – 3.94 in) in 24 size steps, including fractional sizes such as 31.75 mm (1-1/4 in), 38.1 mm (1-1/2 in), and 63.5 mm (2-1/2 in) for inch-standard applications.
Bright polished surface finish reduces friction and provides a degree of corrosion resistance in dry or lightly lubricated environments. Apply appropriate grease or oil for extended service life.
Tight roundness control minimizes vibration and noise in high-speed spindles, reducing heat generation and extending bearing service intervals.
Suitable for deep-groove bearings, angular contact assemblies, ball screws, linear guides, check valves, and precision jigs where dimensional accuracy is non-negotiable.
| Material | Gcr15 high-carbon chromium bearing steel (AISI 52100 equivalent) |
|---|---|
| Grade | G10 (ABMA / ISO standard) |
| Hardness | Approximately 60–66 HRC (through-hardened) |
| Sphericity Deviation | ≤ 0.25 µm |
| Diameter Range | 29 mm – 100 mm (approx. 1.14 in – 3.94 in) |
| Available Diameters | 29, 30, 31, 31.75, 32, 33, 34, 35, 38, 38.1, 40, 45, 48, 50, 55, 60, 63.5, 65, 70, 75, 80, 85, 90, 100 mm |
| Surface Finish | Bright polished |
| Packing Quantity | 1 pc per unit (see variant options for bulk pricing) |
| Weight | See variant options |
Measure the inner diameter of your bearing race or housing bore with a micrometer or digital caliper. The ball diameter must match the original specification exactly — even a 0.1 mm deviation can cause excessive play or binding. Refer to your bearing manufacturer's datasheet or the stamped bearing number for the correct ball diameter.
G10 is a precision grade defined by ABMA Standard 10 and ISO 3290. It specifies that the sphericity deviation (difference between the largest and smallest radii) must not exceed 0.25 µm and the diameter variation across a single ball must be within 0.25 µm. This level of precision is required for applications where vibration, noise, and runout must be minimized, such as machine tool spindles and precision instruments.
Gcr15 (AISI 52100) is the industry-standard material for rolling element bearings. After through-hardening, it achieves approximately 60–66 HRC, giving it excellent resistance to contact fatigue, deformation, and wear under both radial and axial loads. For specific dynamic and static load ratings, consult the bearing assembly's rated capacity rather than the ball alone.
Gcr15 bearing steel is not stainless steel. The bright polished surface provides limited corrosion resistance in dry or lightly lubricated conditions. For wet, humid, or chemically exposed environments, apply a compatible bearing grease or oil, or consider stainless steel balls (AISI 440C) instead. Contact us if you need guidance on material selection for your specific environment.
Yes. G10 grade Gcr15 balls are commonly used as replacement rolling elements in recirculating ball screws and linear guide carriages. Confirm the exact ball diameter specified by the ball screw or guide manufacturer — these assemblies are sensitive to ball size, and using an incorrect diameter will affect preload and positioning accuracy.
For most bearing applications, a lithium-based or synthetic grease rated for the operating temperature and speed is appropriate. For high-speed spindles, a light mineral or synthetic oil may be preferred to reduce churning losses. Always follow the bearing assembly manufacturer's lubrication specification rather than applying lubrication to the ball alone.
The listed variants are sold individually (1 pc per unit). For bulk orders or sizes outside the 29–100 mm range listed, please contact us to confirm availability and pricing.
