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When a worn or undersized ball causes vibration, noise, or premature bearing failure, the fix starts with sourcing a dimensionally accurate replacement. Engineers, maintenance technicians, and serious DIYers who work with valves, pumps, linear slides, or custom bearing assemblies need rolling elements they can trust to hold tolerance across repeated load cycles.
These solid 304 stainless steel ball bearings are available in eight diameters ranging from 31.75 mm (1-1/4 in) to 40 mm (approximately 1-37/64 in). Each ball is machined from 304-grade stainless steel — an austenitic alloy that combines moderate hardness with strong resistance to oxidation and mild corrosion. Sold individually or in packs of five, they suit both single-replacement jobs and small-batch assembly work.
Typical use cases include replacement rolling elements in industrial ball-bearing housings, check-ball seats in hydraulic and pneumatic valves, load-distributing balls in custom linear or rotary fixtures, and decorative or functional hardware in furniture and architectural fittings. The 38.1 mm (1-1/2 in) and 40 mm sizes are particularly common in heavy-duty valve and pump applications where a larger contact surface is required.
| Material | 304 Stainless Steel (austenitic) |
|---|---|
| Ball Type | Solid, one-piece |
| Available Diameters | 31.75 mm / 32 mm / 34 mm / 35 mm / 36 mm / 38.1 mm / 39 mm / 40 mm |
| Diameter Range (inch equiv.) | approx. 1-1/4 in – 1-37/64 in |
| Surface Finish | Smooth, bright-rolled stainless |
| Hardness | See variant options |
| Grade / Tolerance Class | See variant options |
| Quantity per Order | 1 pc or 5 pcs (select above) |
| Weight (per ball) | See variant options |
| Application | Valves, pumps, linear slides, custom bearing assemblies, decorative hardware |
Measure the bore or seat diameter of your housing with a caliper. The ball should match the nominal diameter specified in your assembly drawing or the diameter of the ball you are replacing. For valve check seats, the ball diameter is typically slightly larger than the seat orifice to ensure a positive seal — consult your valve's service manual for the exact specification.
Load capacity depends on the specific application geometry, contact angle, and surface hardness of the mating parts. 304 stainless steel has a typical hardness of around 70–90 HRB, which is lower than hardened chrome steel (52100) bearing balls. These balls are well-suited for moderate-load applications such as valve seats and light-duty linear guides. For high-load or high-speed bearing assemblies, contact us to confirm suitability.
304 stainless steel offers good resistance to atmospheric moisture, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in chloride-rich environments (such as seawater or pool water) where 316 stainless steel would be a better choice. For most indoor industrial, plumbing, and light outdoor applications, 304 is a reliable option.
Yes, provided the diameter matches the original ball size in the bearing. Remove the retainer cage, replace worn balls with new ones of the same diameter, and reassemble. Note that 304 stainless is softer than the hardened steel typically used in precision bearing balls (Grade 10–25); if your application demands tight ABEC-rated tolerances or very high RPM, verify the grade requirement with your bearing manufacturer before substituting.
31.75 mm is the metric equivalent of 1-1/4 inches (a fractional inch standard common in North American equipment), while 32 mm is a true metric size used in ISO-standard assemblies. They differ by 0.25 mm — enough to cause a loose fit if the wrong size is installed. Always confirm whether your application uses inch-based or metric dimensioning before selecting.
The 5-pack price per ball is lower than the single-unit price across all sizes, making it the more economical choice if you need multiple balls for a batch assembly, want spares on hand for future maintenance, or are building a custom fixture that requires several rolling elements of the same diameter.
304 stainless steel is widely used in food-contact applications and meets general FDA material guidelines for stainless steel. However, suitability depends on your specific regulatory requirements and the cleaning chemicals used in your process. Contact us to confirm compliance documentation if your application requires formal certification.
