D/W R156
D/W R156 Bearings
D/W R2-6 R-2Z Bearings
D/W R2-6 R-2Z Bearings

W 638/4-2Z Bearings

W 638/4-2Z
W 638/4-2Z Bearings

W 638/4-2Z Bearings Deep groove ball bearings

Technical Specification of W 638/4-2Z Bearings

Technical Specification of W 618/0.6 Bearings

Dimensions of W 638/4-2Z Bearings

4 mm
Bore diameter
9 mm
Outside diameter
4 mm
5.2 mm
Shoulder diameter
5.2 mm
Recess diameter
8.1 mm
Recess diameter
min.0.1 mm
Chamfer dimension

Abutment Dimensions of W 638/4-2Z Bearings

min.4.8 mm
Diameter of shaft abutment
max.5.1 mm
Diameter of shaft abutment
max.8.2 mm
Diameter of housing abutment
max.0.1 mm
Radius of shaft or housing fillet
Technical Specification of W 618/0.6 Bearings

Caliculation Data of W 638/4-2Z Bearings

Basic dynamic load ratingC
0.364 kN
Basic static load ratingC0
0.114 kN
Fatigue load limitPu
0.005 kN
Reference speed 
140 000 r/min
Limiting speed 
70 000 r/min
Minimum load factorkr
Calculation factorf0

Mass of W 638/4-2Z Bearings

Mass bearing
0.000925 kg

Tolerance Class of W 638/4-2Z Bearings

Dimensional tolerances
Radial run-out

Product Features of W 638/4-2Z Bearings

  • Low friction and operating temperature, low noise and vibration
  • High operating speeds
  • High quality and performance for your application
  • Withstands radial and axial loads in both directions
  • A wide range of greases for most conditions, including food grade greases, high temperature greases and solid oils
  • Improves reliability and provides long bearing and lubricant life

Applications of W 638/4-2Z Bearings

Deep groove ball bearings are the most widely used bearing type and are suitable for many different industries. Matching the versatility of many different applications, they are available in a wide range of designs, variants and sizes. The following are examples of applications where deep groove ball bearings may be used.

Applications of W 618/0.6 Bearings
Applications of Bearings
Wind Turbines
Applications of Bearings
Steel Industry
Applications of Bearings
Applications of Bearings
Food Processing Machinery
Applications of Bearings
Applications of Bearings
Mining & Construction
Applications of Bearings
Electric motors and generators

Product classification of Deep Groove Ball Bearings

FAQ of W 638/4-2Z Bearings

Loads are defined by their direction. Loads perpendicular to the shaft are called radial loads and loads parallel to the shaft are called axial (thrust) loads.

DGBB can carry axial loads in both directions, whereas angular contact ball bearings can only carry axial loads in one direction.

Seals and shields provide additional protection for the bearing components and help to improve and maintain lubrication. In terms of sealing performance, sealed bearings rank best, followed by shielded bearings and finally open bearings.

More Products

Chat with us
Chat with us
Questions, doubts, issues? We're here to help you!
None of our operators are available at the moment. Please, try again later.
Our operators are busy. Please try again later
Have you got question? Write to us!
This chat session has ended

Request A Quote Today