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When a bearing fails mid-project — whether it's a seized skateboard wheel, a corroded conveyor roller, or a worn-out linear slide — the culprit is almost always the wrong material for the environment. Engineers, fabricators, and hands-on builders who work in wet, chemical-exposed, or high-cycle applications need rolling elements that hold up without constant replacement. These 316 stainless steel ball bearings are sized and specified for exactly those conditions.
Each ball is manufactured from 316-grade stainless steel, a molybdenum-bearing alloy that delivers measurably better chloride and acid resistance than standard 304 stainless. The range spans 2.38 mm (approximately 3/32 in) through 60 mm (approximately 2-3/8 in), covering both metric and fractional imperial sizes. Pack quantities run from single pieces up to 500-count bulk bags, so you can order precisely what a repair or production run requires.
Typical use cases include replacement rolling elements in skateboard and inline-skate bearings, load-distributing balls in ball-transfer units and casters, precision spacers in jigs and fixtures, and anti-friction inserts in drawer slides and linear guides. The consistent spherical geometry also makes these balls suitable for check-valve seats, ball-screw assemblies, and decorative or functional hardware in marine environments.
| Material | 316 Stainless Steel (Mo-bearing austenitic alloy) |
|---|---|
| Diameter Range | 2.38 mm – 60 mm (approx. 3/32 in – 2-3/8 in) |
| Available Sizes | See variant options |
| Pack Quantities | 1, 2, 3, 5, 10, 20, 25, 50, 100, 200, 500 pcs |
| Surface Finish | Bright, smooth spherical surface |
| Corrosion Resistance | Chloride, salt spray, mild acid resistant |
| Hardness | See variant options |
| Tolerance Grade | See variant options |
| Shape | Spherical (full ball) |
| Magnetic | Low magnetic permeability (non-ferromagnetic in most grades) |
Measure the bore diameter of your bearing housing or the seat where the ball will sit. Match that measurement to the closest available diameter in the variant selector. For fractional imperial sizes, use the metric equivalents listed — for example, 6.35 mm equals 1/4 in, 9.525 mm equals 3/8 in, and 25.4 mm equals 1 in. If your application requires a specific tolerance grade (G10, G25, etc.), contact us to confirm availability before ordering.
316 stainless contains approximately 2–3% molybdenum, which significantly improves resistance to chloride-induced pitting and crevice corrosion compared to 304 stainless. Carbon steel balls are harder and less expensive but will rust rapidly in wet or chemically active environments. Choose 316 when the application involves salt water, food processing, chemical exposure, or outdoor marine conditions where surface rust is unacceptable.
Standard skateboard bearings (608 type) use 6 mm or 7/32 in (5.556 mm) balls depending on the bearing brand. Inline skate bearings vary. Before ordering, open the bearing shield and measure the existing balls with calipers, or check the bearing manufacturer's specification sheet. The 5 mm, 5.556 mm, and 6 mm variants in this listing are the most commonly requested sizes for skate applications.
316 stainless steel is widely used in food processing and pharmaceutical equipment due to its corrosion resistance and ease of cleaning. However, suitability for a specific regulated application depends on surface finish, lubrication, and compliance requirements in your jurisdiction. Contact us to confirm specifications if your application requires documented material certifications or specific surface roughness values.
For a single repair or prototype, the 1-piece or 5-piece options let you order exactly what you need without excess. For production runs or maintenance stock, the 50, 100, 200, or 500-piece packs offer a lower per-unit cost. The price per ball decreases as pack size increases, so it is worth calculating your expected usage over 3–6 months and ordering accordingly to reduce reorder frequency.
Store balls in a dry, sealed container away from direct contact with dissimilar metals (such as carbon steel tools or hardware) to prevent galvanic staining. While 316 stainless is highly corrosion-resistant, prolonged contact with iron particles or chloride-rich environments without airflow can cause surface discoloration. A clean, dry storage bag or plastic container is sufficient for most workshop conditions.
In most rolling-element applications, a light application of compatible grease or oil improves service life and reduces friction at startup. For check-valve seats or decorative applications, lubrication is typically not required. Use a lubricant compatible with stainless steel and appropriate for your operating temperature range. Avoid lubricants containing chlorinated compounds, which can accelerate corrosion even on 316 stainless under certain conditions.
