1KG Solid Carbon Steel-Gcr15 Steel Ball Bearing Replacement Bearings 9mm-20mm

Carbon Steel balls are a cost-effective choice for general-purpose applications with moderate loads and cycle counts. Gcr15 is a chromium-alloyed bearing steel with higher hardness (typically 60–66 HRC) and better fatigue resistance, making it the preferred choice for higher-load or high-cycle environments such as spindle bearings, ball screws, and precision machinery.

Check your bearing's datasheet or measure the existing balls with a micrometer. The ball diameter must match the bearing's ball complement specification exactly — even a 0.1mm deviation can cause uneven load distribution and accelerated wear. If you are unsure, contact us to confirm before ordering.

Both Carbon Steel and Gcr15 are uncoated steel and offer moderate corrosion resistance. They are suitable for dry or lightly lubricated indoor environments. For humid, wet, or chemically exposed applications, consider stainless steel balls instead. Store unused balls lightly oiled in a sealed container to prevent surface oxidation.

The ball count per kilogram depends on the diameter. Smaller balls (e.g., 9mm) yield significantly more balls per kilogram than larger ones (e.g., 20mm). If you need an exact count for a specific diameter, contact us and we can provide an estimate based on the nominal ball weight.

No. These are uncoated carbon or chromium steel balls without food-grade certification or biocompatibility testing. They are intended for industrial, workshop, and DIY mechanical applications only. For food-grade or medical-device use, stainless steel or ceramic balls with appropriate certifications are required.

These balls are compatible with standard open and shielded deep-groove ball bearings, angular contact bearings, ball-screw recirculation tracks, and linear guide ball complements — provided the diameter matches exactly. They are not pre-assembled into a bearing race; they are loose rolling elements for replacement or custom assembly use.

Yes. Apply a thin film of appropriate bearing grease or oil before installation to reduce initial wear and prevent dry-start damage. The type of lubricant should match your application's speed, load, and temperature requirements. Consult your equipment's service manual for the recommended lubricant specification.