• Small AC/DC Motor Shafts

• Cooling Fan Motors
• Household Appliance Motors
• Servo & Stepper Motor Ends

• Small Gearheads & Reducers
• Timing Pulley Supports
• Office Machine Drives
• Textile Machinery Guides

• Power Hand Tool Spindles

• Measuring Instrument Axles
• Computer Fan Bearings
• Printer & Scanner Rollers

• Conveyor Guide Rollers
• Packaging Equipment
• Vending Machine Mechanisms
• Laboratory & Medical Devices

01. Compact & Reliable Design

The standard series construction offers a sturdy yet space-saving solution with good radial load capacity. Manufactured from high-grade chrome steel, it ensures durability and consistent performance in light to moderate duty cycles.

02. Built-In Contamination Protection

Fitted with double metal shields (ZZ) as standard, providing effective protection against dust and particles while maintaining low running torque. This makes it suitable for applications where re-lubrication is not feasible or where cleanliness is important.

03. Smooth High-Speed Operation

Produced to standard industrial tolerances for reliable quality. The optimized raceway and ball geometry promote smooth, quiet rotation, enabling efficient operation at higher speeds with minimal vibration.

Interchange Part Numbers

Direct replacement for:

• SKF: 638-2Z
• NSK: 638ZZ
• FAG: 638-2Z
• NTN: 638ZZ
• KOYO: 638ZZ

Design & Configuration

The 638-ZZ is supplied with double metal shields (ZZ) as standard, offering basic protection against dry contaminants and retaining grease. For applications requiring different sealing or no closure, alternative configurations may be available upon request.

"For compact motors, light-duty drives, and instruments requiring a shielded bearing, the 638-ZZ offers a reliable, maintenance-friendly solution. Its standard ZZ shields help extend service life in dusty or dirty environments."