57707 (GOST 6364-78)
The bearing consists of three rings (two inner and one wide outer) and rolling elements (tapered rollers) which are connected by a cage. The inner rings with a cages and rolling elements is a CONES. The outer ring is a CUP.
Tapered roller bearings are designed to accomodate combined loads (radial and axial). They have a split construction: the inner ring with the rollers and separator create the unit which can be mounted separately from the outer ring. This is a metric tapered roller bearing.