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When a loose fit, premature wear, or out-of-tolerance rolling element derails your project, the root cause is almost always an imprecise ball diameter. Engineers, makers, and maintenance technicians who need exact sizing — not a close-enough approximation — rely on chrome steel and stainless ball bearings that hold tight dimensional tolerances across every size in the range.
These chrome steel stainless ball bearings are available in diameters spanning 1 mm (≈0.04") through 30 mm (≈1.2"), covering both metric and fractional inch equivalents. The lineup includes standard round sizes such as 1, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 25.4, and 30 mm, as well as precision-ground fractional sizes (e.g., 3/32", 7/64", 1/8", 5/32", 3/16", 1/4", 5/16", 3/8", 1/2", and 3/4") to match both metric and imperial assemblies. Quantities are available in packs of 1, 10, 100, and 1,000 pieces.
Typical applications include DIY drawer slides and linear guides, RC car and drone drivetrain assemblies, 3D printer extruder and axis bearings, skateboard and longboard wheel bearings, robotic joint and actuator mechanisms, and light industrial conveyor or spindle replacements — wherever a smooth, low-friction rolling element is required.
Covers 1 mm through 30 mm in a single listing, including metric standards and fractional inch equivalents, so you can source the exact size your assembly demands.
Manufactured from chrome steel (typically AISI 52100 grade) for high hardness, load capacity, and fatigue resistance in rolling contact applications.
Stainless steel variants in the range offer improved resistance to moisture and mild chemicals, extending service life in damp or lightly corrosive environments.
Order as few as 1 piece for prototyping or up to 1,000 pieces for production runs — quantity pricing scales accordingly so you only buy what you need.
Each ball is ground and lapped to a consistent spherical form, minimizing runout and vibration in high-speed or precision-positioning applications.
Fits standard bearing races, linear guides, ball screws, casters, and custom housings across DIY, robotics, RC, 3D printing, and light industrial use cases.
| Material | Chrome steel (AISI 52100 equivalent) / Stainless steel (see variant options) |
|---|---|
| Diameter Range | 1 mm – 30 mm (≈0.04" – 1.2"); metric and fractional inch sizes available |
| Surface Finish | Ground and lapped spherical surface |
| Hardness | See variant options |
| Grade / Tolerance | See variant options |
| Pack Quantities | 1 / 10 / 100 / 1,000 pieces |
| Application Type | Rolling element, linear guide, caster, custom housing |
| Corrosion Resistance | Standard chrome steel: moderate; Stainless variants: improved |
Measure the inner diameter of your bearing race or housing with a caliper. Select the Dia option that matches that measurement exactly — both the mm value and the inch equivalent are shown in each option label. If you are replacing an existing ball, measure the worn ball or consult the original equipment specification sheet.
Chrome steel (AISI 52100) offers higher hardness and load capacity, making it the standard choice for most dry or lightly lubricated mechanical applications. Stainless steel provides better resistance to moisture, humidity, and mild chemicals, which is preferable in food-adjacent, outdoor, or marine environments where rust is a concern.
Yes. The ground and lapped spherical surface minimizes runout, making these balls compatible with moderate-to-high-speed assemblies including RC car differentials, drone motor shafts, and light spindle bearings. For extreme-speed or precision-instrument applications, confirm the grade tolerance with us before ordering.
Yes. Common 3D printer bearing sizes such as 3 mm, 4 mm, 5 mm, and 6 mm are all available in this listing. Select the matching Dia and your preferred quantity. These balls are compatible with standard LM-series linear bearings and V-slot wheel bearings used in most FDM printers.
For a single repair or prototype, the Qty 1 or Qty 10 options are the most economical. For batch production or stocking a workshop, Qty 100 or Qty 1,000 packs offer a lower per-unit cost. The price per ball decreases as quantity increases, so order the pack size that matches your expected usage over the next few months.
Each Dia option label shows both the metric value and the inch decimal equivalent in parentheses — for example, "3.175 mm ≈ 0.127"" corresponds to a 1/8" ball. Cross-reference this decimal with your housing drawing or OEM specification to confirm compatibility before placing a bulk order.
For most rolling-element and linear-guide applications, applying a light machine oil or bearing grease before installation extends service life and reduces break-in wear. Stainless steel variants in corrosive or wet environments benefit from a water-resistant grease. Chrome steel balls in dry or sealed assemblies may be used as-received, but lubrication is generally recommended.
