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When a project demands a rolling element that fits exactly where you need it, finding the right diameter off the shelf can be a frustrating dead end. These carbon steel solid ball bearings are stocked in 43 diameters from 7 mm (≈0.28") to 120 mm (≈4.72"), giving engineers, makers, and maintenance technicians a single source for the precise size their application requires — without custom-order lead times.
Each ball is machined from carbon steel and finished to a smooth, consistent spherical surface. Diameters span 7 mm through 120 mm (0.28"–4.72"), with select imperial-equivalent sizes such as 12.7 mm (½") and 25.4 mm (1") included for mixed-standard builds. The drillable construction means the ball can be center-drilled or tapped for threaded inserts, making it adaptable to fixtures, jigs, and custom assemblies that standard sealed bearings cannot accommodate.
Typical use cases include load-transfer balls in linear slides and ball-transfer units, pivot points in robotic arms and CNC fixtures, valve seats in fluid-control assemblies, and decorative or functional hardware in furniture and cabinetry. Bulk quantity options (1, 5, 10, 20, 50, or 100 pcs) let prototypers order a single ball to verify fit before committing to a production run.
7 mm through 120 mm, including ½" (12.7 mm) and 1" (25.4 mm) imperial equivalents — no custom orders needed for common sizes.
Solid carbon steel core can be center-drilled or tapped, enabling threaded inserts, axle pins, or custom mounting configurations.
Offers a balance of hardness and machinability suited to moderate-load rolling, sliding, and pivot applications in dry or lightly lubricated environments.
Consistent roundness and surface finish reduce friction and wear in ball-transfer units, linear guides, and valve seats.
Order 1, 5, 10, 20, 50, or 100 pieces per SKU — prototype with a single ball, then scale to production quantities without switching suppliers.
Used in ball-transfer tables, robotic joints, CNC fixtures, furniture hardware, fluid-control valve seats, and decorative metalwork.
| Material | Carbon Steel |
|---|---|
| Diameter Range | 7 mm – 120 mm (≈0.28" – 4.72") |
| Available Diameters | 7, 7.5, 8, 8.5, 9, 9.5, 10, 11, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 25.4, 26, 27, 28, 29, 30, 32, 35, 38, 40, 42, 45, 50, 60, 62, 70, 80, 90, 100, 110, 120 mm |
| Drillable | Yes — center-drillable and tappable |
| Surface Finish | Smooth spherical ground finish |
| Quantity Options | 1 / 5 / 10 / 20 / 50 / 100 pcs per order |
| Hardness | See variant options |
| Tolerance Grade | See variant options |
| Max Load Capacity | Contact us to confirm |
| Corrosion Resistance | Moderate (suitable for dry / lightly lubricated environments; not recommended for prolonged water immersion) |
| Recommended Lubrication | Light machine oil or grease for dynamic applications |
Measure the socket, bore, or retainer seat in your assembly with calipers. The ball diameter should match the seat diameter within the specified tolerance of your design. For ball-transfer units, refer to the unit's rated ball size. If you are between two sizes, order a single piece of each to test fit before committing to a bulk quantity.
Yes. The solid carbon steel construction allows center-drilling and tapping with standard HSS or carbide tooling. Use a center punch to prevent drill wander, apply cutting fluid, and work at low RPM to avoid work-hardening the surface. The resulting hole can accept a threaded insert, axle pin, or set screw depending on your design.
Carbon steel offers moderate corrosion resistance and performs well in dry or lightly lubricated indoor environments. For outdoor exposure, high-humidity conditions, or contact with water or mild chemicals, apply a protective coating (e.g., grease, oil, or paint) or consider stainless steel balls instead. Prolonged unprotected exposure to moisture will cause surface oxidation.
Load capacity depends on diameter, application type (static vs. dynamic), and the material of the mating surface. Larger diameter balls distribute load over a greater contact area and generally support higher loads. For critical load-bearing applications, please contact us with your diameter, expected load (N or lbf), and cycle frequency so we can confirm suitability.
These solid balls are dimensionally compatible with most standard ball-transfer unit sockets and V-groove track systems that specify a matching ball diameter. Always verify the rated ball diameter in your transfer unit's datasheet. The smooth spherical finish ensures consistent rolling contact with the retainer socket.
The per-unit price decreases as quantity increases — ordering 50 or 100 pieces offers a lower cost per ball compared to single-piece pricing. Single-piece orders are ideal for prototyping and fit verification. Bulk packs (20, 50, 100 pcs) are suited for production runs, maintenance stock, or projects requiring multiple identical balls. Select your preferred quantity from the Qty(pcs) option above.
Store in a dry, low-humidity environment away from direct contact with water or corrosive chemicals. Keeping balls in their original packaging or a sealed container with a desiccant packet will extend shelf life. For long-term storage, apply a thin coat of light machine oil to the surface before sealing.
