Bike Hybrid Ball Bearing 163110 16x31x10mm Sealed offers smooth rotation, durability for bikes. Sealed design prevents dust/water, ideal for cycling enthusiasts needing reliable performance.

<h2>Product Parameters</h2> <table> <tr><td>Model</td><td>684</td></tr> <tr><td>Size</td><td>4*9*4mm</td></tr> <tr><td>Material</td><td>Bearing Steel</td></tr> <tr><td>Type</td><td>Single Row Radial Bearing</td></tr> <tr><td>Specification</td><td>Open, Z, ZZ, RZ, 2RZ, RS, 2RS</td></tr> </table> <h2>Product Introduction</h2>This 684 bearing features 4*9*4mm dimensions, made of high-quality Bearing Steel. As a single row radial bearing with 0° contact angle, it offers reliable performance. Available in multiple specifications (Open, Z, ZZ, etc.) and comes with rich stock for quick delivery. Suitable for various industrial applications requiring precision rotation.

<div class="bg-green-50 border-2 border-green-300 rounded-2xl p-6 text-center"><svg class="w-14 h-14 mx-auto text-green-600 mb-3" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z"/></svg><h3 class="text-xl font-black text-green-800">Inquiry Received!</h3><p class="text-sm text-green-700 mt-2 leading-relaxed">Thank you. Our sales team will respond with a firm quote within <strong>2 hours</strong>. For urgent needs, contact us on WhatsApp: <strong>+86 183 6598 6523</strong></p></div>

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