How To Measure Bar Grating Dimensions

Grating measurements are often confused, which can in turn lengthen the quote or ordering process.  In order to make this easier for our customers we have specified how to measure bar grating dimensions below:

  1. Start with measuring the length (Bearing Bar)
    • Also referred to as “span”
    • This is the space between bearing bars (center of bar to center of bar) measured in sixteenth of an inch
  2. Then measure size of bearing bar
    • Expressed in inches of thickness and depth of bar
  3. Measure the width (Cross Bar)
    • Also referred to as “connecting bars”
    • This is measured in inches (center of bar to center of bar), measured along a single bearing bar
    • For riveted grating the measurement in between bearing bar faces (the inside of both bars)

Bar grating dimension examples:

  1. Example of welded grating:
    • 19-W-4
    • Dissected this means welded (W), bearing bars spaced at 1 3/16” (19) on center, cross bars
      spaced at 4” on center (4).
  2. Type
    • Examples of style include welded (W), pressure-locked (P) and Riveted (R)
  3. Material
    • Examples include steel, aluminum and stainless steel

NAAMM Standard Marking:

  1. Standard marking as set by NAAMM will look like the example below and include the characteristics above that have been broken down.
    • 19W4 (1 x 3/16) steel

19-W-4 Labeled Bar Grating Dimensions Drawing


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