Manufacturer designation:

S 684.ZZ.W3,5
628/4-2Z

Design:

The ball bearing consists of two rings (internal and external) and rolling elements (balls), connected with a cage - separator.

Features:

Made of high-carbon chrome bearing steel, characterized by high wear resistance and rolling fatigue strength.
Covered with a layer of stainless steel for working in aggressive environments and at high humidity.
Closed on both sides with seals of the ZZ type.
W3.5 is a special size of the bearing width.