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When a project demands rolling elements that hold tight tolerances under load, moisture, or repeated cycling, undersized or poorly finished balls become the weak link. Engineers, machinists, and serious DIYers who need stainless steel ball bearings across a wide diameter range — from sub-2mm instrument-grade beads to 75mm heavy-duty spheres — often struggle to source the right size without committing to industrial minimum orders.
These stainless steel 304 ball bearings are solid, one-piece spheres machined from 304-grade stainless steel. Available in diameters ranging from 1mm to 75mm (approximately 0.039 in to 2.953 in), they are sold in flexible quantities — from single pieces up to 10,000 units — so you can match your exact project requirement without waste. Surface finish is smooth and consistent across the full diameter range.
Typical use cases include replacement rolling elements in radial and thrust bearing assemblies, check-valve seats in fluid-handling systems, precision counterweights in balancing fixtures, and decorative or functional hardware in custom furniture and cabinetry builds. The corrosion resistance of 304 stainless also makes these balls well-suited for food-adjacent equipment, marine hardware, and outdoor mechanisms where carbon steel would corrode.
Solid spheres machined from 304-grade stainless steel, offering a chromium-nickel alloy composition that resists oxidation, mild acids, and atmospheric corrosion without surface coatings.
A single product line covers 1mm through 75mm (0.039 in–2.953 in), including fractional inch equivalents such as 2.381mm (3/32"), 3.175mm (1/8"), 6.35mm (1/4"), 12.7mm (1/2"), 22.225mm (7/8"), 25.4mm (1"), 31.75mm (1-1/4"), 38.1mm (1-1/2"), 50.8mm (2"), and 63.5mm (2-1/2").
Each ball is finished to a smooth, consistent spherical surface to minimize friction and vibration in rolling-contact applications. Suitable for use in precision bearing assemblies where surface irregularities would cause premature wear.
304 stainless steel maintains its integrity in humid, wet, and mildly corrosive environments — making these balls a reliable choice for marine hardware, outdoor mechanisms, and food-adjacent equipment where carbon steel would rust.
Order from as few as 1 piece up to 10,000 pieces per diameter, depending on size. Smaller diameters support bulk quantities (100–10,000 pcs) while larger diameters are available in smaller counts (1–20 pcs), matching both prototype and production needs.
Dimensioned to standard metric and fractional-inch ball diameters, these loose beads serve as direct replacements in worn bearing assemblies, valve seats, and precision fixtures without custom machining.
| Material | Stainless Steel 304 (18-8 Chromium-Nickel Alloy) |
|---|---|
| Form | Solid sphere (loose ball / loose bead) |
| Diameter Range | 1mm – 75mm (0.039 in – 2.953 in) |
| Fractional Inch Sizes Included | 3/32", 1/8", 1/4", 1/2", 7/8", 1", 1-1/4", 1-1/2", 2", 2-1/2" equivalents |
| Surface Finish | Smooth, precision-ground spherical surface |
| Hardness | See variant options |
| Grade / Tolerance | See variant options |
| Quantity Options | 1 / 5 / 10 / 20 / 30 / 50 / 100 / 200 / 300 / 500 / 1000 / 2000 / 5000 / 10000 pcs (availability varies by diameter) |
| Corrosion Resistance | Suitable for humid, wet, and mildly corrosive environments |
| Max Continuous Service Temp. | Typically up to 870 °C (1600 °F) for 304 SS; verify for your application |
| Magnetism | Slightly magnetic (304 SS may exhibit slight magnetism after cold working) |
| Packaging | Loose, bulk-packed by quantity selected |
Match the ball diameter to the bearing's specified rolling element size, which is typically listed in the bearing's datasheet or stamped on the race. For check valves, the ball must seat flush against the valve seat bore — measure the seat diameter and select a ball that is slightly larger (typically 10–20% oversize) to ensure a positive seal. If you are replacing worn balls in an existing assembly, measure the original ball with a micrometer for an exact match.
304 stainless steel has a tensile strength of approximately 515 MPa (75,000 psi) and a yield strength of around 205 MPa (30,000 psi). For light-to-medium radial and thrust loads in standard bearing assemblies, 304 SS balls perform reliably. For heavy-duty or high-cycle fatigue applications, consider 440C stainless or chrome steel balls, which offer higher hardness. Contact us to confirm suitability for your specific load and cycle requirements.
304 stainless steel contains approximately 18% chromium and 8% nickel, which forms a passive oxide layer that resists rust in most atmospheric and mildly corrosive conditions. These balls are suitable for humid environments, freshwater contact, and food-adjacent equipment. They are not recommended for prolonged exposure to chloride-rich environments (such as saltwater immersion) or strong acids, where 316 stainless steel would be a better choice.
Yes — the diameters listed correspond to standard metric and fractional-inch ball sizes used in common bearing standards (ISO, ABEC, DIN). Verify the exact diameter and tolerance class required by your bearing specification before ordering. If your application requires a specific ABEC grade or surface roughness rating, contact us to confirm availability for your selected diameter.
304 stainless steel is widely used in food processing equipment and is generally considered food-safe for incidental contact applications. However, if your application requires FDA-compliant or NSF-certified components, verify the specific regulatory requirements for your use case. For implantable medical devices, a medical-grade stainless alloy with documented biocompatibility testing is required — these balls are not intended for implantable use.
For prototyping and testing, small quantities (1–10 pcs) allow you to validate fit, clearance, and performance before committing to larger volumes. For production runs, ordering in bulk (500–10,000 pcs for smaller diameters) reduces per-unit cost significantly. Review the quantity options available for your selected diameter in the variant selector above — pricing scales with quantity, so larger orders offer better per-piece value.
304 stainless is the right choice for most general-purpose, corrosion-resistant applications in non-chloride environments. Choose 316 stainless if your application involves saltwater, marine exposure, or chemical processing with chlorides. Choose 440C stainless or chrome steel (52100) if you need higher hardness and fatigue resistance for high-load bearing applications. If you are unsure, contact us with your application details and we can help guide your selection.
