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When a loose ball bearing in a valve seat, pump housing, or custom jig fails mid-project, the entire assembly stops. Engineers, machinists, and hands-on builders who need a reliable replacement or a precision rolling element for a new build require a ball that holds tight tolerances and resists corrosion without constant maintenance. These 304 stainless steel ball bearings deliver exactly that.
Each ball is machined from 304-grade stainless steel — an austenitic alloy known for its balanced strength and corrosion resistance — and ground to a smooth, consistent spherical surface. Available in 25 diameters ranging from 27 mm (approximately 1.06 in) to 80 mm (approximately 3.15 in), including fractional inch equivalents such as 31.75 mm (1-1/4 in), 38.1 mm (1-1/2 in), 50.8 mm (2 in), 63.5 mm (2-1/2 in), and 76.2 mm (3 in), making them compatible with both metric and imperial tooling.
Typical use cases include replacement balls in check valves and ball valves for fluid control systems, rolling elements in custom linear slides and low-load bearing assemblies, decorative or functional hardware accents in furniture and architectural metalwork, and precision gauge balls for dimensional inspection fixtures.
| Material | 304 Stainless Steel (18/8 Austenitic) |
|---|---|
| Ball Type | Solid Round Ball |
| Diameter Range | 27 mm – 80 mm (approx. 1.06 in – 3.15 in) |
| Available Diameters | 27, 28, 29, 30, 31.75, 32, 34, 35, 36, 38.1, 39, 40, 42, 45, 48, 50, 50.8, 55, 60, 63.5, 65, 70, 75, 76.2, 80 mm |
| Surface Finish | Precision ground, smooth spherical surface |
| Corrosion Resistance | Suitable for humid, wet, and mildly corrosive environments |
| Quantity per Order | 1 Piece (per variant) |
| Weight | See variant options |
| Hardness | See variant options / Contact us to confirm |
| Grade / Tolerance | Contact us to confirm |
Measure the bore or seat diameter of your housing with calipers before ordering. The ball should match the seat diameter precisely — a ball that is too small will leak or rattle, while one that is too large will not seat correctly. If your seat is specified in inches, use the fractional equivalents listed (e.g., 1-1/2" = 38.1 mm, 2" = 50.8 mm).
304 stainless steel has a tensile strength of approximately 515 MPa (75,000 psi) and is suitable for light-to-medium load applications such as check valves, ball valves, and low-speed rolling elements. For high-load or high-speed precision bearing races, a hardened chrome steel (52100) or ceramic ball is typically recommended. Contact us if you need to confirm suitability for a specific load rating.
304 stainless steel forms a passive chromium oxide layer that resists rust in most humid and wet conditions. It performs well in freshwater and mild chemical exposure. However, it is not fully resistant to chloride-rich environments (e.g., saltwater or chlorinated pools) — for those applications, 316 stainless steel is a better choice. Contact us if you need a 316-grade option.
Yes. Sizes listed as fractional equivalents — 31.75 mm (1-1/4"), 38.1 mm (1-1/2"), 50.8 mm (2"), 63.5 mm (2-1/2"), and 76.2 mm (3") — are machined to those exact inch-derived dimensions. They are designed to fit standard imperial valve seats and housings without modification.
304 stainless steel is widely used in food processing and sanitary plumbing equipment. However, confirm that your specific application's regulatory requirements (e.g., NSF, FDA, 3-A Sanitary Standards) are met before installation, as certification depends on the full assembly, not just the ball material. Contact us to confirm if you need documentation.
These balls are precision ground to a smooth spherical surface. The ground finish reduces friction and surface irregularities that cause uneven wear in valve seats and light rolling applications. If your application requires a specific surface roughness (Ra value) or grade classification (e.g., G25, G10), contact us to confirm before ordering.
Each variant is currently listed as 1 piece per order. If you need larger quantities for a production run or maintenance stock, contact us directly — bulk pricing may be available depending on the diameter and quantity required.
