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The standard parts show only structural members in the subject release out of the box in the trial (Platinum) version of 2018 (the latest version that is CADWorx compatible as I now understand it). How do you access the standard fastener libraries?
Better late than never
Probably the easiest way. Right click on the ribbon area - Choose "Panels"- Choose "Components" as in image 01
On the "Components" window navigate trough the several options. Image 02