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