Good morning Charles.
In reality the force F1 is the support reaction of the force F2.
I have an F1 support that is done on a dia crown. Ext of 42.0 [mm] and dia int of 30.0 [mm].
The force F2 of 30 [KN] acts on a ring of dia ext of 30.0 [mm] and dia int of 23.0 [mm]
Thickness of washer 3.25 [mm]
Cordially.
Denis