W 638/8 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Basic Information
Main Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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Product Overview and Core Advantages
The W 638/8 R-2Z is a single row deep groove ball bearing designed for exceptional performance in compact applications. Engineered with stainless steel construction throughout, it offers excellent corrosion resistance. Its key advantages include the ability to handle significant radial loads, reliable operation provided by shielded seals, and pre-lubrication for immediate, maintenance-free service. This bearing is ideal for applications demanding high precision, reliability, and a long service life in challenging environments.
W 638/8 R-2Z Bearing Model Code Explained, Specifications & Naming Convention
- W 638/8: Base designation for a metric, single row deep groove ball bearing series with an 8 mm bore.
- R: Designates a flanged outer ring, which facilitates precise axial location and simplifies housing design.
- 2Z: Indicates that the bearing is shielded on both sides. This provides effective protection against contaminant ingress while allowing for high-speed operation with minimal friction.
Structural Features and Performance Benefits
Robust Stainless Steel Construction: All components, including rings, balls, and cage, are made from stainless steel, ensuring superior corrosion resistance and durability, making it suitable for harsh or wash-down environments.
Flanged Outer Ring Design: The integrated flange (18 mm outer diameter) allows for easy and secure mounting, reducing assembly time and cost while providing excellent axial location.
Optimized for Radial Loads: The deep groove raceway and single row design are engineered to efficiently support radial dynamic load ratings of 161 lbf, delivering reliable performance.
Sealed and Pre-Lubricated for Longevity: The double-shielded (2Z) design effectively retains grease and excludes contaminants. Combined with factory-applied grease, this creates a maintenance-free system ideal for applications where re-lubrication is difficult.
W 638/8 R-2Z Bearing Typical Application Areas
The W 638/8 R-2Z is widely used in various precision instruments and compact machinery, including:
- Small electric motors and gearboxes
- Medical and dental equipment
- Food processing machinery
- Office automation equipment (printers, scanners)
- Precision spindles and small conveyor systems
