The behind code and meaning if FAG bearing

The behind code and meaning if FAG bearing:
F-steel entity cage, rolling body guide.
FA- steel entity cage, outer ring guide.
FAS- steel entity cage, outer ring guide with Lubricant slot.
FB- steel entity cage, the inner guide.
FBS- steel entity cage, inner guidance with lubrication groove.
FH-entity steel cage, carburizing hardening.
H, H1-carburizing quenching Cage.
P5-tolerance level in line with international standards ISO requirements 5.
P4-tolerance level in line with international standards ISO requirements 4.
P2-tolerance level in line with international standards ISO of 2 (excluding tapered roller bearings)