2pcs S689 9x17x5mm Stainless Steel Hybrid Ceramic Bearings (S689C, S689 2RS) Precision replacement bearings designed to improve smoothness, reduce friction, and extend service life in small rotating assemblies. These hybrid ceramic bearings combine ceramic balls with stainless steel races and feature double rubber seals for protection against dirt and debris. Key features Size and quantity: 2 pieces, inner diameter 9 mm, outer diameter 17 mm, width 5 mm. Construction: stainless steel races with hybrid ceramic rolling elements for lower friction and improved wear resistance. Seal type: 2RS doublesided rubber seals to help keep contaminants out and retain lubricant. Models: compatible with S689 and S689C form factors; marked as S689 2RS for sealed versions. Function: smooth, quiet rotation for spindles, shafts, and small hubs. Why you need these bearings Reduce friction and noise: Ceramic rolling elements run smoother than steelonly bearings, producing less friction and lower operational noise in compact assemblies. Increased durability: Stainless steel races resist corrosion while ceramic elements provide hardness and wear resistance, helping bearings last longer under regular use. Protection from contaminants: Rubber seals shield internal components from dust and water splash, reducing maintenance frequency and preventing premature failure. Direct replacement fit: Standard S689 dimensions allow straightforward swapin replacement where 9x17x5 mm bearings are required. Performance and compatibility Optimized for small precision applications where space is limited and smooth rotation matters. Suitable for fishing reels and RC cars; fits applications specifying S689 or S689C sealed bearings of 9x17x5 mm. Provides consistent rotational performance for both low and moderatespeed uses. Practical use scenarios worn bearings in a spinning or baitcasting fishing reel to restore smooth line retrieval and reduce drag noise. Upgrade wheel, drivetrain, or gearbox bearings in an RC car to achieve smoother acceleration and quieter operation. Install in small hobby motors or mechanical assemblies that require a sealed 9x17x5 mm bearing for reliable performance. Installation and care Press or pressfit into a clean, properly sized housing to avoid misalignment or race damage. Check seals after installation and avoid exposing bearings to excessive impact or prolonged temperature environments. If additional lubrication is needed, use a compatible light bearing grease; sealed bearings come prelubricated for typical use. Contains: 2 pieces of S689 9x17x5 mm stainless steel hybrid ceramic bearings, sealed type S689 2RS and S689C compatible. Suitable for direct replacement in equipment requiring these exact dimensions and specifications.