Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a bearing fails mid-run or a replacement ball doesn't seat cleanly, the root cause is almost always dimensional inconsistency or inadequate corrosion resistance. Engineers, maintenance technicians, and precision hobbyists who need a reliable drop-in replacement — or a bulk supply for production — require balls that hold tight tolerances without surface degradation over time. These G100 stainless steel bearing balls are designed for exactly that application.
Each ball is manufactured from either 316L or 440C stainless steel and ground to G100 grade per ISO 3290. Diameters span 1.5mm to 38.1mm (approximately 0.059" to 1.500"), covering the most common metric and fractional sizes used in standard and miniature bearing assemblies. The solid, smooth surface finish minimizes rolling friction and supports consistent load distribution across the contact zone.
Typical use cases include replacement balls in deep-groove and angular-contact ball bearings, valve seats in fluid-handling systems requiring corrosion resistance, and precision jigs or fixtures where dimensional repeatability is critical. The 316L grade suits marine, chemical, and food-processing environments; the 440C grade offers higher hardness for load-bearing and wear-intensive applications.
316L offers superior corrosion resistance in wet, saline, and chemical environments. 440C provides higher hardness (typically 58–62 HRC) for load-bearing and wear-critical applications.
Available from 1.5mm (0.059") to 38.1mm (1.500"), covering metric and fractional sizes for miniature to medium-duty bearing assemblies.
Ground and lapped to ISO 3290 G100 tolerance, ensuring consistent sphericity and diameter deviation for reliable seating and smooth rolling.
No seams, no hollow cores. The solid construction and smooth surface finish reduce friction, support uniform load distribution, and extend service life.
Order from 1 piece for a single repair up to 1,000 pieces for production or maintenance stock. Pricing scales with quantity for cost-effective bulk purchasing.
Dimensionally consistent with standard bearing ball specifications, making these suitable as direct replacements in most OEM and aftermarket bearing housings.
| Material | 316L Stainless Steel / 440C Stainless Steel |
|---|---|
| Diameter Range | 1.5mm – 38.1mm (0.059" – 1.500") |
| Precision Grade | G100 (ISO 3290) |
| Surface Finish | Solid, smooth ground |
| Hardness (316L) | Typically 79–90 HRB |
| Hardness (440C) | Typically 58–62 HRC (hardened) |
| Corrosion Resistance (316L) | Excellent — suitable for marine, chemical, food-grade use |
| Corrosion Resistance (440C) | Good — suitable for dry and mildly humid environments |
| Pack Size Options | 1, 5, 10, 50, 100, 200, 500, 1000 Pcs |
| Available Diameters | See variant options |
| Weight per Unit | See variant options |
316L is an austenitic stainless steel with low carbon content and added molybdenum, giving it excellent corrosion resistance in marine, chemical, and food-processing environments. It is softer (typically 79–90 HRB) and better suited for applications where corrosion resistance is the priority. 440C is a martensitic stainless steel that can be hardened to 58–62 HRC, making it the choice for high-load, wear-intensive bearing applications where hardness matters more than maximum corrosion resistance.
G100 refers to the precision grade as defined by ISO 3290. It specifies the maximum allowable deviation in sphericity, diameter variation, and surface roughness. G100 is a mid-range precision grade suitable for general-purpose and replacement bearing applications. If your application requires tighter tolerances (e.g., G10 or G25), please contact us to confirm availability.
Check the bearing manufacturer's datasheet or measure the existing ball with a micrometer. The ball diameter must match the bearing's specified ball size exactly — even a 0.1mm deviation can affect load capacity and rolling smoothness. Common metric sizes include 3mm, 4mm, 5mm, 6mm, 8mm, and 9mm; common fractional sizes include 1.588mm (1/16"), 2.381mm (3/32"), 6.35mm (1/4"), and 7.938mm (5/16").
The 316L grade is well-suited for food-processing, marine, and chemical environments due to its molybdenum content and low carbon level, which resist pitting and crevice corrosion. The 440C grade offers good corrosion resistance in dry or mildly humid conditions but is not recommended for prolonged exposure to saltwater or aggressive chemicals without additional protective measures.
Yes, provided the diameter matches the original specification. These balls are ground to standard dimensions and are compatible with most OEM and aftermarket bearing housings. Always verify the required ball diameter, grade, and material against your bearing's datasheet before ordering. If you are unsure, contact us to confirm compatibility.
For a single bearing repair, the 1 Pcs or 5 Pcs option is typically sufficient — most standard bearings use between 7 and 15 balls depending on bore size. For maintenance stock or production runs, the 100, 200, 500, or 1000 Pcs packs offer better per-unit pricing. Bulk packs are also useful when working across multiple bearing sizes to keep a consistent supply on hand.
Store balls in a clean, dry environment away from abrasive particles and direct contact with dissimilar metals that could cause galvanic corrosion. Keep them in their original packaging or a sealed container. For 440C balls in humid environments, a light coating of machine oil during storage helps prevent surface oxidation. Avoid dropping or impacting the balls, as even G100-grade balls can develop micro-fractures from impact damage.
