Did you know that you can use the keywords CBSCR and CBNUT in the *.dat files to preselect a counter bore hole diameter?
Usually IFX takes the first counter bore hole diameter from the ifx_screw_data.cfg file.
With the keywords CBSCR and CBNUT you can preselect another diameter.
In the example you see that for the screw ISO 4014 - 5.6 the counter bore DIN974-2 R1 should be preselected.
While assembling this screw, you get the following result in the Screw Fastener Definition dialog: