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When a loose or worn bearing ball causes wobble, noise, or premature failure in a precision assembly, finding the exact replacement diameter is the real challenge. Engineers, hobbyists, and repair technicians working with miniature bearings, micro valves, flow meters, and fine-pitch linear guides need stainless steel ball bearings that hold tight tolerances across a wide size range — without ordering from a specialty distributor with a two-week lead time.
These stainless steel ball bearings are sold in 1000-piece lots and span diameters from 0.5 mm (approx. 0.020 in) to 3.175 mm (approx. 0.125 in / ⅛ in). Each ball is manufactured from corrosion-resistant stainless steel, offering a smooth, consistent surface finish suited to low-load radial and axial bearing applications. Select your exact diameter from the variant dropdown above.
Typical use cases include replacement balls for miniature deep-groove ball bearings, check-valve seats in pneumatic and hydraulic circuits, precision instrument pivots, pen and stylus mechanisms, and small-scale linear motion systems where a specific ball diameter is specified by the OEM. The 2.381 mm (3/32 in) and 3.175 mm (1/8 in) sizes are common inch-fraction equivalents frequently called out in legacy engineering drawings.
| Material | Stainless Steel |
|---|---|
| Diameter Range | 0.5 mm – 3.175 mm (0.020 in – 0.125 in) |
| Available Diameters | 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.25, 1.3, 1.35, 1.4, 1.5, 1.6, 1.65, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.381, 2.5, 2.65, 2.8, 2.85, 2.9, 3.0, 3.175 mm |
| Quantity per Pack | 1000 pcs |
| Surface Finish | Smooth spherical, corrosion-resistant |
| Tolerance Grade | See variant options |
| Load Rating | See variant options |
| Hardness | See variant options |
| Application | Miniature bearings, check valves, instruments, linear guides |
Measure the inner race groove diameter of your bearing housing using a micrometer or caliper. The replacement ball should match the original ball diameter exactly — even a 0.1 mm difference can affect preload and running clearance. If you have the bearing part number, cross-reference the manufacturer's datasheet for the specified ball diameter.
These balls are intended for low-to-moderate load and speed applications such as instruments, valves, and light-duty miniature bearings. For high-speed spindle bearings or heavy radial loads, consult the specific load and speed ratings for your bearing assembly and contact us to confirm suitability before ordering.
Stainless steel offers good resistance to oxidation and light moisture exposure, making these balls suitable for indoor mechanical assemblies, instruments, and pneumatic valves. They are not recommended for continuous immersion in saltwater or strong acids without additional protective measures.
Yes. 2.381 mm is the metric equivalent of 3/32 inch, and 3.175 mm equals 1/8 inch. These sizes are commonly specified in legacy imperial engineering drawings and are interchangeable with their inch-fraction counterparts within normal manufacturing tolerances.
Stainless steel balls are widely used as check-valve seats in pneumatic and hydraulic circuits. Select the diameter that matches your valve body's seat bore. Verify the seat angle and sealing requirements with your valve specification — a smooth spherical surface is essential for reliable sealing.
Each variant is sold in a 1000-piece lot. To order multiple diameters, add each size as a separate line item to your cart. If you need a custom quantity or a size not listed, contact us to confirm availability.
