Recently we received many long heavy thick plastic drawers of fasteners, all with Fastenal labels. One drawer was full of 3/8” x 2” square head capscrew (yes, capscrew with integral head-washer and tapered start threads.). Another drawer held similar items but configured as bolts. I rarely see square-head fasteners and I’m interested in what they are usually used for. I know they can be useful when a row of fasteners adjacent to a raised edge allows the edge to prevent head rotation, but that doesn’t happen too often. Is their some other role where square-heads are particularly useful or are they nearly obsolete?