High Precision Miniature Concave Chrome Steel Ball Bearing – 1/4"x1/2"x3/16" (R188U/R188KK)

Ultra-Precise Chrome Steel Construction
– Crafted from high-grade chrome steel for exceptional durability and smooth rotation, ensuring long-lasting performance under high-speed conditions.
Micro Inch Deep Groove Design
– Features a precision-engineered deep groove raceway for reduced friction and enhanced load capacity, ideal for high-torque applications.
Perfect for YoYos & Micro Mechanics
– Specifically designed for high-performance yo-yos, miniature machinery, and micro-inch applications requiring flawless balance and spin accuracy.
Concave Inner Ring for Secure Fit
– The unique concave inner ring (R188U/R188KK) ensures a snug fit, preventing slippage in fast-moving components.
Global Wholesale Advantage
– Direct bulk pricing with unbeatable wholesale rates, backed by worldwide logistics for seamless large-quantity orders.
Versatile Industrial & Hobby Use
– Ideal for precision instruments, robotics, model making, and any application demanding ultra-fine, low-friction bearings.