Ключевые слова:
Low-alloy steels, Alloy steels, Hardness testing, Thread pitch, Mechanical testing, Testing conditions, Hexagonal-head fasteners, Threaded fasteners, Proof stress, Diameter, Unalloyed steels, Proof loading, Grades (quality), Fasteners, Internal-thread fasteners, Nuts, Mechanical properties of materials, Chemical composition, Tensile strength, Failure (mechanical), Bolted joints, Hardness, Designations, Steels, Screwed joints, Threads