High-Precision Ceramic Miniature Deep Groove Ball Bearings (691-699 ZZ Series)
Ultra-smooth ceramic balls ensure minimal friction and superior wear resistance for high-speed applications. Full stainless steel shields (ZZ type) provide enhanced dust and moisture protection, extending operational lifespan. Open-type design allows easy lubrication maintenance, ideal for precision instruments and small machinery. Perfect for micro-motors, dental tools, robotics, and optical devices requiring quiet, vibration-free performance. Exact sizing (691-699 series) guarantees seamless compatibility with industrial and DIY projects. Global bulk sourcing advantage ensures unbeatable wholesale pricing for large-quantity orders.