The DN 6 x 40 metal pipes are produced with zinc, aluminium or brass alloy jacket and carbon steel expansion rod coated with a zinc layer with a minimum thickness of 8 μm. The differences between the types of screwing bolts are the shape of the collar or the shape of the jacket grips. Use: The DN 6x40 metal bolts are intended for various fixing works in civil and industrial constructions (walls, ceilings and plasterboard wall cladding with fire resistance), on concrete, brick or BCA bases, in compliance with the Law 10/1995 on quality in construction, as amended and supplemented, and the technical regulations in force.