The Hole Selection node is used for selecting pairs of holes to be connected by fasteners. A Fasteners node always has at least one Hole Selection subnode. You can add more such subnodes as needed.

The default is to use an automatic search for matching hole pairs, in which case a single Hole Selection node is usually sufficient. When using manual selections, you need to add one Hole Selection node per hole pair.

When a Hole Selection node is added, the selection is set to All edges, which implies that all edges on the source selection in the parent Fastener node are shown as applicable. This is the standard configuration when working in the automatic mode. You can, however, remove some edges from the list to avoid that they are taken into account.

In either case, all edges around a hole must be selected in order for a hole to be defined. The Group by continuous tangent option is a useful tool for making fast and correct manual selections of holes.

Select a method for detecting the fastener holes, Automatic or Manual. For Automatic, you can also adjust Radius tolerance, Center offset tolerance, and Normal orientation tolerance. These values control when two holes are deemed to form a pair. The exact definitions are given in Automatic Hole Detection in the theory chapter.

In the automatic mode, the source and destination boundaries selected in the parent Fasteners node are scanned in order to find all holes. The scan is limited to the selections in the Edge Selection and Edge Selection, Destination sections. Then, hole pairs are identified when holes on both the source and destination have the same radius and have their centers located on the same axis normal to the two boundaries.

Physics tab with Fasteners node selected in the model tree: