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When a worn or undersized ball causes vibration, noise, or premature bearing failure, finding the exact replacement diameter quickly matters. Engineers, maintenance technicians, and serious DIY builders who work with metric and fractional-inch bearing assemblies need a reliable source of accurately sized rolling elements — without ordering a full bearing unit just to replace a handful of balls.
These carbon steel ball bearings are available in 27 diameter options spanning 1.0 mm to 7.938 mm (approximately 0.039 in to 0.313 in), including common fractional-inch equivalents such as 3.175 mm (1/8 in), 6.35 mm (1/4 in), and 7.938 mm (5/16 in). Pack quantities range from 10 to 5,000 pieces per order, allowing both small repair jobs and bulk restocking from a single listing.
Typical use cases include replacement rolling elements in miniature radial bearings, linear slide assemblies, and drawer or cabinet hardware; load-distributing balls in check valves and ball-end linkages; and precision spacers in custom jigs, fixtures, and hobby CNC builds where consistent diameter tolerance is critical.
| Material | Carbon steel |
|---|---|
| Diameter Range | 1.0 mm – 7.938 mm (0.039 in – 0.313 in) |
| Available Diameters | 1, 1.5, 2, 2.5, 3, 3.175, 3.5, 3.969, 4, 4.5, 4.763, 4.8, 5, 5.5, 5.556, 5.9, 5.953, 6, 6.35, 6.5, 6.6, 6.747, 6.8, 7, 7.144, 7.5, 7.938 mm |
| Inch Equivalents Included | 1/8 in (3.175 mm), 5/32 in (3.969 mm), 3/16 in (4.763 mm), 7/32 in (5.556 mm), 15/64 in (5.953 mm), 1/4 in (6.35 mm), 17/64 in (6.747 mm), 9/32 in (7.144 mm), 5/16 in (7.938 mm) |
| Pack Quantity Options | 10, 20, 30, 50, 80, 100, 150, 200, 250, 300, 400, 500, 800, 1000, 5000 pcs |
| Ball Type | Solid, single ball (loose, not assembled in races) |
| Surface Finish | See variant options |
| Weight per Unit | See variant options |
| Tolerance Grade | See variant options |
| Recommended Application | Miniature bearings, linear slides, check valves, ball-end linkages, drawer hardware, hobby CNC |
Remove one ball from the existing bearing and measure its diameter with a micrometer or digital caliper. Match that measurement to the closest size in the variant list. For fractional-inch bearings, cross-reference the inch size to its mm equivalent (e.g., 1/4 in = 6.35 mm). If you are unsure, contact us to confirm before ordering.
Carbon steel balls are appropriate for standard radial and thrust loads at moderate speeds. For applications involving very high RPM, elevated temperatures, corrosive environments, or food-contact requirements, a different material such as stainless steel or ceramic may be more appropriate. Review your application's load, speed, and environmental conditions before selecting a ball material.
Carbon steel has limited corrosion resistance compared to stainless steel. In dry or lightly lubricated indoor environments, carbon steel balls perform reliably. In humid, wet, or chemically exposed environments, apply a compatible lubricant or consider stainless steel alternatives to prevent surface oxidation that could affect rolling performance.
Yes. This listing includes both pure metric diameters and fractional-inch equivalents expressed in millimeters (e.g., 6.35 mm = 1/4 in). Select the diameter that matches your housing specification. The ball itself is dimensionally identical regardless of whether the original design used metric or inch notation.
The minimum order quantity varies by diameter — some sizes start at 10 pieces, others at 20 or 50 pieces. Each size and quantity combination is a separate variant. To order multiple diameters, add each size as a separate line item to your cart. Bulk quantities up to 5,000 pieces per size are available for production or restocking needs.
For a one-time repair or prototype build, a small pack (10–50 pcs) is typically sufficient. If you maintain equipment with recurring ball replacement intervals, or if you run production assemblies, ordering 500–5,000 pieces reduces per-unit cost and minimizes reorder frequency. Review the price-per-piece across pack sizes before deciding — larger packs offer a lower unit cost.
Carbon steel balls in the 3–6 mm range are commonly used in drawer slide retainers and cabinet ball-bearing hardware. Verify the ball diameter specified by your slide manufacturer before ordering. If the original balls show flat spots or pitting, replacing the full complement with fresh balls of the correct diameter typically restores smooth, quiet operation.
