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When a loose or undersized ball causes play in a bearing race, spindle, or valve seat, the entire assembly loses accuracy and service life. Engineers, machinists, and serious DIY builders who need stainless steel ball bearings that hold tight tolerances across a wide size range will find exactly what they need here — from 1 mm up to 10 mm diameter, including fractional inch equivalents such as 3/32" (2.381 mm), 1/8" (3.175 mm), 5/32" (3.969 mm), 3/16" (4.763 mm), 1/4" (6.35 mm), and 9/32" (7.144 mm).
These stainless steel ball bearings are manufactured from corrosion-resistant stainless steel with a smooth, lapped surface finish. Diameters span 1 mm to 10 mm (approximately 0.039" to 0.394"), available in quantities of 100, 500, or 1,000 pieces per order to suit both prototyping and production runs.
Typical use cases include replacement balls in deep-groove radial bearings for 3D printer carriages, load balls in linear motion slides and drawer runners, check-ball seats in pneumatic and hydraulic valves, and rolling elements in custom jigs, fixtures, and hobby robotics joints — all applications where consistent diameter and corrosion resistance are non-negotiable.
| Material | Stainless Steel |
|---|---|
| Diameter Range | 1 mm – 10 mm (0.039" – 0.394") |
| Available Sizes | 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 mm |
| Surface Finish | Lapped / Smooth spherical |
| Pack Quantities | 100 pcs / 500 pcs / 1,000 pcs |
| Corrosion Resistance | Yes — stainless steel alloy |
| Hardness | See variant options |
| Grade / Tolerance Class | See variant options |
| Application | Bearings, valves, linear slides, robotics, DIY assemblies |
| Unit of Sale | Per pack (quantity selected at checkout) |
Measure the inner diameter of your bearing race or housing bore with a caliper. The ball diameter should match the specification of the original rolling element — typically stamped on the bearing shield or listed in the manufacturer's datasheet. If you are replacing balls in a standard deep-groove bearing, the ball diameter is usually 20–30% of the bearing's bore diameter. When in doubt, contact us to confirm before ordering.
These stainless steel ball bearings are appropriate for light-to-medium load applications such as radial bearings in small motors, linear slides, drawer runners, and hobby robotics joints. For heavy industrial or high-speed precision applications requiring a certified grade (e.g., Grade 10 or Grade 25 per ABMA/ISO standards), please contact us to confirm the grade specification before ordering.
Stainless steel provides good resistance to rust and oxidation in humid, wet, and mildly corrosive conditions. They are suitable for food-adjacent equipment, marine hardware, and outdoor mechanisms exposed to moisture. For highly aggressive chemical environments (strong acids, chlorinated solutions), verify material compatibility with your specific application before use.
Yes. The fractional-inch equivalents listed are: 2.381 mm = 3/32", 3.175 mm = 1/8", 3.969 mm = 5/32", 4.763 mm = 3/16", 6.35 mm = 1/4", and 7.144 mm = 9/32". These correspond to standard imperial ball bearing sizes used in North American and British equipment. Always verify with a caliper before installing.
Each variant is a single size and quantity combination. To order multiple sizes, simply add each size/quantity variant to your cart separately. There is no minimum order requirement per size, and you can mix any combination of sizes and pack quantities in a single checkout.
The three quantity options let you match your order to your actual need. The 100-piece pack suits small repairs or prototyping. The 500-piece pack is a good balance for workshop stock. The 1,000-piece pack offers the lowest per-unit cost and is suited for production runs or high-consumption applications. All packs contain the same stainless steel balls at the selected diameter.
Store in a dry, covered container away from direct moisture and abrasive dust. While stainless steel resists corrosion, prolonged exposure to standing water or salt spray can still cause surface staining over time. A sealed plastic bag or parts bin with a desiccant packet is sufficient for long-term storage.
