R188-2RS Sealed Miniature Ball Bearing For Moisture-Prone Environments | 6.35×12.7×4.763 mm

• Dental handpieces requiring sterilization resistance
  
• Laboratory centrifuges and mixing equipment
  
• Medical diagnostic devices and fluid handling systems
  
• Surgical power tools and orthopedic instruments

• Food grade conveyor rollers and guides
  
• Bottling line equipment and filling machinery
  
• Commercial kitchen appliances and mixers
  
• Packaging equipment requiring washdown capability

• Fishing reel mechanisms and line guides
  
• RC boats and marine propulsion systems
  
• Outdoor power equipment and garden tools
  
• Bicycle wheel hubs and pedal assemblies

• Laboratory balance mechanisms
  
• Optical instruments and positioning stages
  
• Cleanroom automation equipment
  
• Pharmaceutical manufacturing machinery

01. Enhanced Contamination Protection

The defining feature of the R188-2RS is its double contact rubber seal configuration. Unlike metal-shielded variants, these synthetic rubber seals maintain light contact with the inner ring, creating a labyrinth that effectively blocks liquid ingress and fine particle contamination. This protection makes the bearing suitable for applications where washdown, steam cleaning, or outdoor exposure is routine, extending service life in demanding environments.

02. Permanent Lubrication Retention

Pre-packed with high-quality lithium-based grease, the R188-2RS is designed for maintenance-free operation throughout its service life. The contact seals not only exclude contaminants but also prevent grease leakage, ensuring consistent lubrication even in applications involving centrifugal force or elevated temperatures. This feature proves particularly valuable in sealed assemblies where re-greasing access is impossible.

03. Corrosion-Resistant Variants Available

While standard R188-2RS bearings utilize chrome steel (GCr15/SAE 52100), the sealed configuration pairs exceptionally well with stainless steel materials for maximum corrosion protection. AISI 440C stainless steel versions provide comprehensive resistance to rust and mild chemicals, making them ideal for medical, pharmaceutical, and marine environments where equipment undergoes regular sterilization or saltwater exposure.

Interchange Part Numbers

Direct replacement for industry-standard miniature bearings:

• SKF: D/W R188-2RS1
• NSK: R188-2RS
• EZO: SR188-2RS
• NTN: R188-2RS
• Timken: SR188-2RS
• GRW: 6350B-2RS

Design & Configuration

The R188-2RS features double contact rubber seals as standard, providing enhanced protection for applications involving moisture, dust, or particulate exposure. The slightly wider 4.763mm width accommodates the seal design while maintaining compatibility with standard housing dimensions. For maximum corrosion resistance, stainless steel AISI 440C variants offer superior performance in medical, food processing, and marine environments . High-precision ABEC-5 versions are available for applications demanding tighter running accuracy . For specialized requirements, hybrid ceramic versions with silicon nitride balls provide reduced friction and higher speed capability .

"From the sterile environments of medical device manufacturing to the moisture-rich conditions of food processing, the R188-2RS delivers reliable sealed protection in a compact inch-dimensional package trusted by equipment designers worldwide."