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When a corroded or undersized ball causes a valve to leak, a bearing to seize, or a DIY mechanism to bind, finding the exact replacement diameter quickly matters. Engineers, machinists, hobbyists, and maintenance technicians who need a reliable source of A2 (304) stainless steel loose ball bearings in a wide size range will find this listing covers virtually every common metric and fractional-inch diameter in one place.
Each ball is solid A2 (304) stainless steel — an austenitic alloy containing approximately 18% chromium and 8% nickel — precision-ground to a spherical form. Diameters span 1mm through 70mm (roughly 0.039 in to 2.756 in), including fractional-inch equivalents such as 3/32" (2.381mm), 1/8" (3.175mm), 3/16" (4.763mm), 7/32" (5.556mm), 1/4" (6.35mm), 5/16" (7.938mm), 7/16" (11.113mm), 1/2" (12.7mm), 7/8" (22.225mm), 1" (25.4mm), 1-1/4" (31.75mm), 1-1/2" (38.1mm), 2" (50.8mm), and 2-1/2" (63.5mm). Quantity options range from 1 pc to 500 pcs per order.
Typical applications include replacement balls for ball bearing assemblies and linear slides, check-valve seats in fluid-handling systems, ball-end linkages in RC and robotics builds, decorative sphere accents in metalwork, and precision counterweights in instrument mechanisms. The non-magnetic grade and passive oxide layer make these balls well-suited for food-adjacent, marine, and chemical-exposure environments.
| Material Grade | A2 / 304 Stainless Steel (18% Cr, 8% Ni) |
|---|---|
| Ball Form | Solid sphere |
| Diameter Range | 1mm – 70mm (approx. 0.039" – 2.756") |
| Fractional-Inch Sizes Included | 3/32", 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2", 1-1/2", 2", 2-1/2" (see variant list) |
| Surface Finish | Precision-ground; see variant options for grade |
| Corrosion Resistance | Passive chromium oxide layer; suitable for humid and mildly corrosive environments |
| Magnetic Properties | Low permeability (non-magnetic in annealed state) |
| Quantity Options | 1 / 10 / 50 / 100 / 200 / 500 pcs |
| Hardness | See variant options |
| Tolerance Class | See variant options |
| Operating Temperature | Typically –196°C to +870°C (–321°F to +1598°F) for 304 SS |
Measure the bore or seat diameter of your housing with a caliper. The ball diameter should match the rated ball size of the bearing race or the seat diameter of the valve body. For bearing replacements, check the bearing's datasheet or part number — it will list the ball diameter explicitly. If you are between two sizes, contact us to confirm before ordering.
A2 (304) contains 18% chromium and 8% nickel and resists corrosion in most indoor, humid, and mildly acidic environments. A4 (316) adds 2–3% molybdenum, which significantly improves resistance to chloride pitting — making it the preferred choice for marine, coastal, or chlorinated-water applications. For general mechanical and food-adjacent use, A2 (304) is typically sufficient.
A2 (304) stainless steel is widely used in food-processing equipment and is generally considered food-safe for incidental contact. However, suitability depends on your specific regulatory requirements (e.g., FDA, NSF, EU food-contact regulations). If your application requires certified food-grade documentation, please contact us to confirm before ordering.
A2 (304) stainless steel forms a passive chromium oxide layer that resists rust in most environments. However, prolonged exposure to chlorides (e.g., salt water, bleach), strong acids, or high-temperature oxidizing conditions can cause surface staining or pitting. For highly corrosive environments, consider A4 (316) grade. Regular rinsing and drying after wet exposure will extend service life.
Yes, provided the ball diameter matches the original specification exactly. Sealed and shielded bearings use the same ball sizes as open bearings — the shield or seal is a separate component. Verify the ball diameter from the bearing's datasheet or by measuring the existing balls with a micrometer before ordering.
Yes. This listing includes both metric and fractional-inch diameters. Common equivalents available include: 2.381mm = 3/32", 3.175mm = 1/8", 4.763mm = 3/16", 6.35mm = 1/4", 7.144mm ≈ 9/32", 9.525mm = 3/8", 12.7mm = 1/2", 22.225mm = 7/8", 25.4mm = 1", 31.75mm = 1-1/4", 38.1mm = 1-1/2", 50.8mm = 2", 63.5mm = 2-1/2". Select the size from the variant dropdown that matches your requirement.
For a single bearing or valve repair, the 1 pc or 10 pcs option is typically sufficient. For prototyping or small-batch production, 50 or 100 pcs provides a working stock without over-committing. For ongoing production runs or bulk inventory, the 200 or 500 pcs options offer a lower per-unit cost. Select the quantity that matches your Quantity(pcs) option in the variant selector above.
