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When a bearing failure means a stalled project, a seized mechanism, or a costly rebuild, the material you choose matters. Engineers, machinists, and serious DIYers who work in wet, chemical, or food-adjacent environments know that carbon steel balls corrode fast — leaving pitting, binding, and premature wear. These A2 stainless steel ball bearings G200 are built for exactly those conditions, delivering reliable rolling performance where standard steel falls short.
Each ball is manufactured from A2 (AISI 304) austenitic stainless steel and meets G200 grade tolerances. Diameters span 1 mm through 22.225 mm (approximately 0.039 in to 0.875 in), covering a wide range of bearing housings, valves, pumps, and precision assemblies. Surface finish is smooth and consistent across the full diameter range, supporting low-friction rolling contact.
Typical use cases include replacement rolling elements in skateboard and inline skate bearings, valve seats in fluid-handling equipment, load-distributing balls in drawer slides and casters, and precision spacers in jigs and fixtures. The corrosion resistance of A2 stainless also makes these balls well-suited for marine hardware, laboratory instruments, and food-processing machinery where hygiene and rust prevention are non-negotiable.
| Material | A2 Stainless Steel (AISI 304) |
|---|---|
| Grade | G200 (ISO 3290) |
| Diameter Range | 1 mm – 22.225 mm (0.039 in – 0.875 in) |
| Available Diameters | 1, 1.5, 2, 2.381, 2.5, 3, 3.175, 3.5, 3.969, 4, 4.5, 4.763, 5, 5.5, 6, 6.35, 6.5, 7, 7.144, 8, 8.5, 9, 9.5, 10, 11, 12, 12.7, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 22.225 mm |
| Surface Finish | Smooth, ground spherical surface |
| Corrosion Resistance | Good resistance to moisture, mild acids, and oxidation |
| Magnetic Properties | Low magnetic permeability (non-magnetic for most practical purposes) |
| Pack Quantities | 1, 3, 5, 10, 20, 30, 50, 100, 200, 500, 1000, 2000 pcs (varies by diameter) |
| Hardness | See variant options |
| Weight per Ball | See variant options |
| Operating Temperature | Typically –20°C to +300°C (–4°F to +572°F) |
| Standards | ISO 3290 G200 |
Measure the bore or seat diameter of your bearing housing, valve body, or assembly using a caliper. The ball diameter should match the specified rolling element size in your equipment's service manual or OEM parts list. If you are replacing worn balls, measure the original ball directly. Our range covers 1 mm to 22.225 mm, including both metric and fractional (inch-derived) sizes such as 3.175 mm (1/8 in), 6.35 mm (1/4 in), and 12.7 mm (1/2 in).
G200 is a tolerance grade defined by ISO 3290, indicating the maximum allowable deviation in diameter and spherical form. G200 balls have a diameter variation of up to 200 millionths of an inch (approximately 5 µm). This grade is well-suited for general-purpose bearings, valves, drawer slides, casters, and light-duty precision assemblies. For high-speed spindle bearings or precision instruments requiring tighter tolerances, consider G10–G100 grades — contact us to confirm availability.
A2 (AISI 304) stainless steel offers strong resistance to oxidation and corrosion in most everyday environments, including fresh water, mild acids, and humid conditions. However, it is not fully immune to corrosion in chloride-rich environments (such as seawater or salt spray) or concentrated acid exposure. For marine or highly corrosive applications, A4 (AISI 316) stainless steel balls may be more appropriate. Contact us if you need A4 grade.
Yes — these balls are dimensionally compatible with standard bearing housings and races that accept the corresponding ball diameter. They are drop-in replacements for rolling elements in deep-groove ball bearings, angular contact bearings, thrust bearings, and valve seats. Always verify the required ball diameter and grade against your equipment specifications before ordering.
A2 stainless steel is widely used in food-processing machinery and laboratory equipment due to its corrosion resistance and ease of cleaning. These balls are not coated or lubricated, making them suitable for dry or externally lubricated assemblies in food-adjacent environments. For direct food-contact or FDA-regulated applications, confirm material compliance with your regulatory requirements. We recommend consulting your equipment manufacturer's specifications.
For single repairs or prototyping, packs of 1–10 pieces are the most cost-effective starting point. If you are maintaining a fleet of equipment, running a production line, or stocking a workshop, larger packs (100–2,000 pieces) offer a lower per-unit cost. The price per ball decreases as pack size increases, so ordering the quantity you expect to use within 6–12 months typically gives the best value without tying up excess inventory.
A2 stainless steel retains its mechanical properties across a broad temperature range, typically from –20°C to +300°C (–4°F to +572°F) for standard applications. At elevated temperatures above 300°C, sensitization of the alloy may occur, reducing corrosion resistance. For cryogenic or very high-temperature applications, contact us to confirm suitability.
