Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a worn bearing race, a leaking valve seat, or a precision assembly demands an exact replacement ball, sourcing the right diameter in the right alloy can stall an entire project. Machinists, maintenance engineers, hobbyists, and small-batch manufacturers who need stainless steel loose ball bearings in a wide range of sizes — without committing to a full industrial minimum order — will find this listing covers the full spectrum from sub-millimeter micro balls to 20 mm heavy-duty spheres.
These stainless steel ball bearings are available in two alloy grades — 201 Stainless Steel and 304 Stainless Steel — with diameters spanning 0.5 mm (0.020 in) through 20 mm (0.787 in). Pack sizes are sold by weight (0.1 Kg, 0.2 Kg, or 0.5 Kg), with approximate piece counts listed per variant so you can estimate quantity before ordering. Surface finish is smooth and consistent, suitable for load-bearing and rolling contact applications.
Typical use cases include replacement balls for miniature and standard radial bearings in motors and gearboxes, valve seat balls in check valves and ball valves for fluid control systems, precision balls for linear slides and ball screws in CNC and automation equipment, and decorative or functional hardware in furniture, cabinetry, and DIY mechanical projects requiring corrosion-resistant rolling elements.
Covers 0.5 mm through 20 mm in a single listing, including fractional inch equivalents (e.g., 3/32", 1/8", 3/16", 1/4") for cross-compatibility with imperial-spec assemblies.
201 Stainless Steel offers solid corrosion resistance at a lower cost for general-purpose use; 304 Stainless Steel provides superior resistance to oxidation and mild acids, suited for food-adjacent, marine, or chemical environments.
Sold by weight (0.1 Kg, 0.2 Kg, 0.5 Kg) with approximate piece counts per variant, allowing you to order the quantity you need without excess waste or shortage.
Manufactured to maintain uniform roundness and smooth surface finish, reducing vibration and wear in rolling contact applications such as bearing races and valve seats.
Stainless steel construction resists rust and surface oxidation in humid, wet, or mildly corrosive environments — extending service life compared to carbon steel alternatives.
Suitable for radial bearings, thrust bearings, check valves, ball screws, linear guides, decorative hardware, and any assembly requiring a precision rolling element in the selected diameter.
| Material / Alloy | 201 Stainless Steel or 304 Stainless Steel (see variant options) |
|---|---|
| Diameter Range | 0.5 mm – 20 mm (0.020 in – 0.787 in) |
| Available Diameters | 0.5, 0.6, 0.8, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.58, 1.7, 1.8, 1.9, 2.0, 2.381, 2.5, 2.8, 3.0, 3.175, 3.5, 3.969, 4.0, 4.5, 4.76, 5.0, 5.556, 6.0, 6.35, 7.0, 7.938, 8.0, 8.5, 9.0, 9.525, 10, 11, 12, 12.7, 13, 14, 15, 16, 17, 18, 19, 20 mm |
| Pack Weight Options | 0.1 Kg / 0.2 Kg / 0.5 Kg (see variant options) |
| Approximate Piece Count | See variant options (listed per diameter and pack weight) |
| Surface Finish | Smooth, consistent spherical surface |
| Shape | Spherical (loose ball) |
| Corrosion Resistance | Good (201) / Excellent (304) |
| Tolerance Class | See variant options or contact us to confirm |
| Application Type | Bearings, valves, ball screws, linear guides, precision assemblies |
201 Stainless Steel is a cost-effective option with good general corrosion resistance, suitable for dry or mildly humid indoor environments. 304 Stainless Steel contains higher nickel content, offering superior resistance to oxidation, moisture, mild acids, and chloride exposure — making it the preferred choice for food processing equipment, marine hardware, chemical handling, or any application where the balls will contact liquids or corrosive media regularly.
Measure the existing ball with a micrometer or caliper to the nearest 0.01 mm. Match that measurement to the closest available diameter in the variant list. For imperial-spec assemblies, common fractional equivalents include: 1/16" ≈ 1.588 mm, 3/32" ≈ 2.381 mm, 1/8" ≈ 3.175 mm, 5/32" ≈ 3.969 mm, 3/16" ≈ 4.762 mm, 1/4" ≈ 6.35 mm, 5/16" ≈ 7.938 mm, 3/8" ≈ 9.525 mm, 1/2" ≈ 12.7 mm. If you are unsure, contact us with your assembly specs.
Yes. Stainless steel balls are widely used as valve seat balls in check valves, ball valves, and pressure relief valves. For valve applications, select the diameter that matches your valve seat bore. 304 Stainless Steel is recommended for valves handling water, mild chemicals, or food-grade fluids due to its superior corrosion resistance.
Each variant listing includes an approximate piece count based on the pack weight and ball diameter (e.g., 0.5 Kg ≈ 960 pcs for 5.0 mm diameter). Because piece counts are weight-based approximations, the actual count may vary slightly. The listed counts are conservative estimates to help you plan your order quantity.
304 Stainless Steel is commonly used in food processing and pharmaceutical equipment due to its corrosion resistance and ease of cleaning. However, for regulated food or medical applications, please verify that the specific grade and surface finish meet your applicable standards (e.g., FDA, NSF, ISO) before use. Contact us if you need documentation or additional material certification details.
These balls are manufactured with a smooth, consistent spherical surface finish suitable for rolling contact applications. For precision-critical applications requiring a specific grade (e.g., G10, G25, G100 per ISO 3290), please contact us to confirm the available tolerance class for your selected diameter before ordering.
Yes. Each diameter and material combination is a separate variant. You can add multiple variants to your cart in a single order to source several sizes at once — useful for maintenance kits, repair stock, or prototyping where multiple ball sizes are needed.
🛒 Select your Diameter, Material, and Pack Size above, then add to cart.
