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When your project demands consistent roundness, smooth surface finish, and reliable hardness, finding the right steel ball in the exact diameter you need can be a frustrating search. Whether you are a hobbyist loading a slingshot, a technician replacing bearing balls, or a maker sourcing precision spheres for a valve or jig, this listing covers you with one of the widest diameter selections available — from 1mm (≈0.04") all the way to 200mm (≈8").
These are chrome steel (GCr15 / 52100 equivalent) balls, known for their high hardness (typically 60–66 HRC), excellent wear resistance, and consistent spherical geometry. Diameters span 1mm–200mm (approximately 0.04"–8"), with both metric and fractional inch sizes represented. Quantities are available in packs of 1, 5, or 10 pieces depending on the selected diameter.
Typical use cases include slingshot ammunition and ball-bearing replacement for skateboards, inline skates, and industrial equipment; check valve and flow-control applications in plumbing and pneumatic systems; precision jig fixtures, lapping tools, and calibration references in metalworking and machining shops; and decorative or craft applications such as marble runs, kinetic sculptures, and jewelry-making.
Available from 1mm to 200mm (≈0.04"–8"), covering metric, fractional-inch, and custom sizes in a single listing.
Through-hardened chrome steel delivers high surface hardness (typically 60–66 HRC) and excellent fatigue resistance for demanding applications.
Precision-ground surface finish ensures low runout and smooth rolling action in bearing races, valve seats, and slingshot pouches.
Order 1, 5, or 10 pieces per variant — ideal for single replacements, small repairs, or stocking up for repeated use.
Chrome steel provides moderate corrosion resistance suitable for indoor and dry-environment applications; apply light oil for extended storage.
Used in slingshots, skateboard and inline-skate bearings, check valves, pneumatic systems, lapping fixtures, marble runs, and precision calibration jigs.
| Material | Chrome Steel (GCr15 / AISI 52100 equivalent) |
|---|---|
| Surface Finish | Precision ground, bright finish |
| Hardness | Typically 60–66 HRC (through-hardened) |
| Diameter Range | 1mm–200mm (≈0.04"–8") |
| Available Quantities | 1 pc / 5 pcs / 10 pcs (varies by diameter) |
| Grade / Tolerance | See variant options |
| Weight (per piece) | See variant options |
| Corrosion Resistance | Moderate (suitable for dry / indoor environments) |
| Typical Applications | Slingshots, bearings, check valves, lapping, calibration, DIY |
Most slingshot pouches are designed for balls in the 6mm–12mm (≈0.24"–0.48") range for general use, while larger pouches accept up to 25mm (≈1"). Check your slingshot manufacturer's recommendation or measure the pouch opening. Select the matching diameter from the variant dropdown above.
Yes. Standard skateboard bearings (608 type) use 6mm–7mm balls. Inline skate bearings vary by model. Measure your existing balls with calipers or check your bearing's specification sheet, then select the matching diameter. Chrome steel (GCr15) is the same material used in most OEM bearing balls.
Chrome steel balls are through-hardened to typically 60–66 HRC, making them highly resistant to deformation under normal bearing and slingshot loads. They are not intended for use as hammering tools or in applications that exceed their rated load capacity.
Chrome steel provides moderate corrosion resistance — suitable for dry indoor environments and occasional outdoor use. For prolonged outdoor or wet-environment exposure, apply a light coat of machine oil or consider stainless steel balls instead. Store in a dry location to prevent surface oxidation.
Smaller diameters (up to approximately 13mm) are available in packs of 10 or 5 pieces, making them economical for slingshot use or bearing replacement where multiple balls are needed. Larger diameters (above approximately 13.5mm) are typically sold in packs of 5 or individually (1 pc) due to their greater size and weight. Select your preferred quantity from the Quantities option when choosing your variant.
Use a digital caliper to measure the diameter of an existing ball from your bearing, or look up the bearing part number (e.g., 608, 6200, 6001) in a bearing specification table — the ball diameter is listed in the internal geometry data. Match that measurement to the closest available diameter in the variant list. If you are between two sizes, contact us to confirm before ordering.
Yes. Chrome steel balls are commonly used as check valve seats in water, oil, and pneumatic systems. Ensure the ball diameter matches your valve seat bore precisely — a loose fit will not seal correctly. For food-grade or highly corrosive media, stainless steel balls are recommended instead.
