Aluminum Ball bearings Ø 0.5-70 mm Diameter Precision aluminum ball Solid Balls

Measure the inner diameter of your housing, race, or valve seat with a caliper. The ball diameter should match the specified bore size — for bearing applications, consult the bearing manufacturer's tolerance table (typically G10–G100 grade). For valve seats, the ball should be 0.1–0.3 mm larger than the seat orifice to ensure a positive seal. If you are unsure, order a small sample pack (10 or 50 pcs) to test fit before committing to a bulk quantity.

Aluminum has a tensile strength of approximately 70–310 MPa depending on alloy grade, which is significantly lower than bearing-grade steel (typically 1,500–2,000 MPa). These balls are suitable for light-duty contact, low-load valve seats, decorative use, and applications where weight reduction is prioritized over compressive strength. They are not recommended as direct replacements for steel balls in high-load radial or axial bearing races.

Aluminum naturally forms a thin, stable aluminum oxide (Al₂O₃) layer on its surface when exposed to air, which provides passive corrosion resistance in most ambient and mildly humid environments. For prolonged immersion in water, saltwater, or contact with strong acids or alkalis, additional anodizing or coating is recommended. For typical outdoor hobby use or light fluid-contact applications, the bare aluminum surface performs reliably without additional treatment.

Yes. Several listed diameters are fractional inch equivalents expressed in millimeters: 1.588 mm = 1/16 in, 3.175 mm = 1/8 in, 6.35 mm = 1/4 in, 9.525 mm = 3/8 in, 12.7 mm = 1/2 in, 15.875 mm = 5/8 in. Select the millimeter value that matches your inch specification. If you need a size not listed, contact us to confirm availability.

For prototyping or single-unit repair, the 1 pc, 10 pcs, or 50 pcs options let you validate fit and function before committing to larger quantities. For small-batch production (typically 100–500 units), the 100 pcs or 500 pcs packs offer a cost-effective middle ground. For high-volume manufacturing or resale, the 1,000 pcs, 5,000 pcs, and 10,000 pcs packs provide the lowest per-unit cost. Note that not all pack sizes are available for every diameter — check the variant selector for your specific size.

Aluminum balls are compatible with low-pressure, low-temperature fluid systems carrying water, light oils, or air. They are not recommended for systems carrying strong acids, alkalis, or chlorinated fluids, as these can attack the oxide layer. For potable water applications, verify that your local plumbing code permits aluminum contact with drinking water. For high-pressure systems (above approximately 150 psi / 10 bar), consult an engineer before use, as aluminum's compressive yield strength may be insufficient for the seat load.