First and foremost among fasteners are nuts and bolts in all their many variations. Yet screws, rivets, and hooks and eyes, are also used to join components and metal sheets and sections, which must not separate under load. Tensile tests are a fundamental aspect of quality assurance for threaded fasteners and are used to determine both breaking load and strain under axial loading.(…)
via Mechanical testing of threaded fasteners | Fastener + Fixing Technology.