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METAL BAR GRATINGS
- Introduction to Metal Bar Gratings
- Welded Steel Grating
- Swaged Aluminum Grating
- Aluminum Plank Grating
- Pressure Locked Grating
- Stainless Steel Grating
- Riveted Grating
- Stair Treads
- Heavy Duty Grating
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- Fasteners & Banding
- Panel Widths & Layout
- Manufacturing & Installation
Pressure Locked Grating
Grating Pacific offers two distinct types of Pressure Locked Gratings which are identified by their method of assembly. Manufactured without the introduction of heat or riveting, these gratings provide a finished product with attractive architectural lines. This pleasing appearance makes Pressure Locked Gratings ideal candidates for architectural and ornamental applications such as grilles, screens and fences. Additionally, pressure locked methods of manufacturing allow for the production of close mesh gratings with minimal open area. Pressure Locked Gratings with bearing bars spaced at 11/16" and 7/16" on center conform with the rigid spacing requirements of the Americans with Disabilities Act (ADA). These products are commonly installed at the entrance to public buildings where concerns of pedestrian traffic and high heeled shoes coincide with needs for ventilation and drainage.SWAGED PRESSURE LOCKED GRATINGS
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.Isometric Swaged Intersection
Close Mesh Type PS-7-4
DOVETAIL PRESSURE LOCKED GRATINGS
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.Isometric Dovetail Intersection
Standard Mesh Type PD-19-4
MATERIALS
Commonly produced in ASTM A-1011 mild carbon steel, 6000 series aluminum and 300 series stainless steels, Pressure Locked Gratings can also be manufactured in select specialty alloys. For assistance in selecting appropriate specialty alloys, please contact our sales department.FABRICATION
All Grating Pacific Pressure Locked Gratings are fabricated to size on a "per order" basis. To enhance longevity, all products are manufactured with each outside cross bar/bearing bar intersection fillet welded in accordance with NAAMM standards. Banding provides additional transverse stiffness and it is highly recommended that all Pressure Locked Gratings be specified with all cutouts and open ends banded.
PS-7-4 Swaged Steel Grating
CUSTOM BEARING BAR SPACINGS
The Dovetail Pressure Locked method of manufacturing is particularly flexible in that it allows for the production of gratings with custom bearing bar spacings. Small quantities can easily be manufactured to suit the precise needs of most applications. To specify non-standard spacings, simply insert the desired bearing bar center-to-center spacing (in sixteenths of one inch) in lieu of the standard spacings shown in the table above (note that 4" and 2" cross bars centers should be maintained).Example: PD-8-4 For Grating With Bearing Bars at 1/2" On Center
SWAGED PRESSURE LOCKED GRATINGS
The bearing bar sizes offered for pressure locked gratings are common to those in welded steel, swaged aluminum and stainless steel gratings. In that the sizes and spacings of the bearing bars are consistent with these products, the load tables are similarly interchangeable. Load tables for pressure locked gratings can be found on the following pages:Steel Grating Load Table
Aluminum Grating Load Table
Stainless Grating Load Table
