Keywords: Steels; Fasteners; Corrosion-resistant steels ; Stainless steels; Mechanical properties of materials ; Mechanical testing; Set screws; Screws (bolts) ; Designations; Chemical composition; Torsion testing; Torque; Hardness; Hardness testing; Grading (quality); Austenitic steels; Working range ; Temperature; Rockwell hardness measurement; Brinell hardness measurement; Vickers hardness measurement