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Pressure locked grating is a kind of high strength grating. Shengyang Grating offers two distinct types of Pressure Locked Gratings which are identified by their method of assembly.Pressure Locked Gratings manufactured by swaging are designated by the profile "PS." These products are assembled by inserting hollow tube cross bars into pre-punched holes in the bearing bars and then swaging the cross bars (similar to the aluminum gratings). This permanently locks the entire cross bar/bearing bar intersection within the interior of the bearing bar.Pressure Locked Gratings manufactured with deep rectangular cross bars are identified as dovetail pressure locked and are designated by the profile "PD." These products are assembled by pre-punching both the bearing bars and cross bars, aligning the bars in an egg-crate manner, and deforming the cross bar into the dovetail slot in the bearing bar under intense hydraulic pressure