Remove a non-standard fastener size you previously added in Fusion.
On the Design workspace toolbar, click Solid > Insert > Insert Fastener .
The Insert Fastener dialog displays.
In the dialog, browse to a fastener family and select the fastener you need.
Set the Nominal Size and/or the Nominal Length to the non-standard size you want to delete.
At the bottom of the Insert Fastener dialog, click the Delete Fastener button .
In the Edit Fastener dialog, click OK.
The selected non-standard size is removed from the list.