What Is a Miniature Bearing?
A miniature bearing is a precision ball bearing with a bore diameter of 10mm or less. Despite their small size, these bearings are manufactured to the same (or tighter) tolerance standards as full-size bearings, often ABEC-5 or ABEC-7 class.
Applications
Dental handpieces, drones and UAVs, fishing reels, skateboard wheels (608 series), medical devices, small electric motors, and precision instruments. Available from JTEKT/Koyo and NSK through SMS Bearings.
Frequently Asked Questions
What sizes are considered miniature bearings?
Bearings with a bore diameter of 10mm or less are generally classified as miniature. The smallest commercially available bearings have bore diameters of 1mm. Common miniature series include 600 (e.g., 608), 620, 630, and MR (metric miniature) series.
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