workable gage w14

huangyhg

workable gage w14
folks,
what do the 3 numbers 3 - 7 1/2 - 3 represent in the workable gage table for w14x145 to w14-808?
why is it 3 values instead of one?
find a job or post a job opening
this represent the hole spacing for bolts through the flange with the center of the web at the center of the 7 1/2". (four bolts with three interior dimensions)