Chrome Stainless Steel Ball Bearings Diameters 1/1.5/2/3/4/4.5/5/6/7/8/9/10mm

Measure the inner diameter of your bearing race or the seat where the ball sits using a digital caliper. Match that measurement to the closest available size. For imperial applications, note that 2.381mm = 3/32", 3.175mm = 1/8", 3.969mm = 5/32", 4.763mm = 3/16", 6.35mm = 1/4", and 7.144mm = 9/32". When in doubt, size down rather than up — an oversized ball will bind in the race.

These chrome stainless steel balls are appropriate for light-to-moderate load applications such as drawer slides, skate wheels, hobby motors, and small fixtures. For heavy industrial loads, high-RPM spindles, or extreme-temperature environments, consult a bearing engineer and verify the specific grade and hardness rating required for your application.

Chrome stainless steel offers good resistance to surface oxidation in dry and low-humidity indoor environments. Prolonged exposure to moisture, salt spray, or corrosive chemicals can still cause surface degradation over time. For wet or marine environments, consider 316 stainless steel or ceramic balls instead. Wiping the balls lightly with a thin machine oil after handling helps preserve the surface finish.

No — these are loose precision balls only. They do not include a race, cage, retainer, or housing. They are intended as replacement elements for existing bearing assemblies, or for use in custom fixtures and ball transfer units where you supply your own race or seat.

Most standard skateboard bearings (608-type) use 6mm balls. Inline skate bearings also commonly use 6mm or 6.35mm balls depending on the bearing model. Always open the bearing and measure the existing balls with a caliper before ordering, as ball size varies by bearing manufacturer and grade.

For a single bearing replacement, a 10-piece pack typically provides enough balls with a few spares. For workshop stock or recurring maintenance tasks, the 100- or 300-piece packs offer a lower per-unit cost and reduce reorder frequency. The 500-piece pack is suited for production environments or resellers who need consistent on-hand inventory across multiple sizes.

These balls are not certified for food-contact or medical-grade applications. For those environments, FDA-compliant 316L stainless steel or ceramic balls with documented material certifications are required. Contact us to confirm suitability for your specific use case before ordering.