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Bar Grating Specification
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Specification Considerations
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M.gif (1037 bytes)etal bar grating can be defined as a series of metal bars positioned vertically, placed an equal distance apart and joined by cross members to form a rectangular or reticuline pattern.  Typically manufactured from mild carbon steel, 6000 series aluminum and 300 series stainless steels, bar gratings are also available in specialty metal alloys to suit nearly any application.

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BEARING BARS- The vertically positioned bars are designated as the bearing bars.  These bars range in size from 3/4"x1/8" for light pedestrian traffic to 7"x1/2" for extreme vehicular loads.  Typically, the spacing of the bearing bars is indicated in sixteenths of an inch, measured from the center of one bar to the center of the adjacent bar.  This center to center or on center  spacing ranges from 7/16" to 19/16"(1-3/16) on standard grating products.  Standard gratings are also available with wider spacings providing even greater open area, but should not be specified without consulting the manufacturer.  Heavy Duty grating products are commonly manufactured with bearing bar spacings ranging from 15/16" to 38/16"(2-3/8") on center.

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CROSS BARS- The bars used to secure the position of the bearing bars are commonly designated as the cross bars.    Cross bar profiles vary according to the method of assembly and material selected.  As with bearing bars, cross bar spacing is measured as on center spacing.  The customary cross bar spacing is 4" on center.   On special order, 2" on center and other special spacings are also available.
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METHODS OF ASSEMBLY
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WELDED GRATING

Manufactured by welding the cross bar/bearing bar intersection, typically by automated forge welding machines.  Provides a secure welded connection and is ideal for most industrial applications.		 SWAGED PRESSURE LOCKED

Cross bars are inserted into pre-punched holes in the bearing bars and hydraulically swaged to lock the bars in place.  Most effective for the manufacture of aluminum, stainless, and close mesh gratings.
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DOVETAIL PRESSURE LOCKED

Assembled by inserting punched bearing and cross bars into an "eggcrate" configuration and deforming the cross bars under hydraulic pressure. Excellent for the manufacture of architectural gratings.		 RIVETED GRATING

Bearing bars are permanently riveted to reticulated cross bars to form our most rigid and durable products.  Extremely well suited to absorb shock and impact loads from cart and dolly traffic.
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