Analysis Body — One body of an analysis: a Solid with its Material, treated as solid material or as a thin wall of one thickness.
Bolted Joint — Joins two parts with bolts placed in holes they already have: every hole through the head-side part that continues as a blind hole in the threaded part gets a solid bolt, sized from the hole and its counterbore, its thread reaching 1.5 bolt diameters into the threaded part (never past the hole's bottom).
Contact — Joins two face selections with bonded contact, so load passes between their domains through a spring of the contact stiffness.
Tie — Joins two face selections rigidly: the follower faces move exactly with the driver faces.