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Beam Gage
Beam gages refers to the center to center spacing of holes located about a beam's centerline perpendicular to it's web. AISC publishes allowable or workable gages in the various manuals. It is sometimes misunderstood that these gages must be used in all cases. That is a misconception. The following material may help in understanding that gages may be varied to suit unique circumstances.
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Note: The greater to and less than signs in this PDF are inaccurate suffice it to say that the lower number is the smallest flange width that that gage should be used at. Also a smaller gage can be used provided it allows for installation of the bolts.
Note: The previous user misunderstands the use of the signs <(Less Than) and >(Greater Than). The signs are presented correctly in their context thus: Flanges of 5 but less than 6 use a 2-3/4 gage Flanges of 6 but less than 8 use a 3-1/2 gage Flanges of 8 and greater than 8 use a 5-1/2 gage Flanges of 10 and greater than 10 use a 7-1/2 gage The context of these statements is to explain the traditional gages referenced in the Manual. It is, of course permitted to use a smaller gage in a larger flange as the article explains. The purpose of the article is to explain the origin of standard gages and the proper use of non-standard gages.
