There are many different flanges used in “Four Bolt Connection Systems” and each one has a corner designed especially for use with that flange. This makes stocking material for each system complicated and often confusing. Also, the physical design of many corners often requires their manufacture from heavy gauge steel. The Dyn-O-Mate Quad Corner is a versatile corner for use in Dyn-O-Mate J as well as many other flanges. The unique design of this corner results in performance like that expected from heavier gauge, but at a lower cost.