Please refer to the picture and select right type of bearings before your order (Sealed or Shield on BOTH or SINGLE side of the bearing). Suffix on the bearing just for differentiating between Sealed and Shield type of bearing. It would not affect the use of our product.

Description:
Deep Groove Ball Bearings are one of the most widely used rolling bearings. They are used to accommodate radial and axial loads in both directions.
Suitable for all kinds of industrial equipment, micro motor, small rotary motor, office equipment and so on.
With small friction and high-limit speed, Deep Groove Ball Bearings are cost-effective and require little maintenance.
Chromium Steel (GCr15) made with heat treating, provides high and uniform hardness, good wear resistance.
Single-row, pre-lubricated, normal accuracy.

Selection Guide:
Shields (Designation Suffix Z/ZZ) - High speed. Protect from dirt and debris.
Sealed (Designation SuffixRS/2RS) - Made of sheet steel reinforced nitrile butadiene rubber (oil- and liquid-resistant). Lower limit speed than Shield Bearings.

Specification:
Model: 638Z
Shield Type: Single Shield
Cage Material: Stamping Steel
Number of Pack: 1 Pcs
Inner Diameter (d): 8mm
Outer Diameter (D): 28mm
Thickness (B): 9mm
Dynamic Load Rating (Cr): 4.55kN
Static Load Rating (Cor): 1.95kN
Accuracy Class: P0 (ABEC1)
Noise Level: Z2
Weight: 29g