Manufacturer designation:

684.H.ZZ

Designation due to standards:

1000084 - GOST 7242-81
1000084 - GOST 8338-75
684.ZZ - DIN 625-1 ISO15:2011
618/4 ZZ 

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 type.