Stretching bolts used in mines, sand, gravel and coal mines, crushing and screening plants to fix the sieve, from bridge splice plates to beam-column connections, from stadia roof trusses to rail switches and transitions, are connected to the tension plate in conveyor applications and ensure the tension of the belt. They are known for their dome-shaped head structure, as well as being known as a type of bolt that can be used in almost all steel connections when their superior tensile strength and ductility are combined and eventually gains universality.