Stainless steel flange for exhaust systems 2-Bolt Exhaust Flange 51mm Stainless steel flange for exhaust systems Premium exhaust flange for connections in exhaust system When building an exhaust system, separators have to be included. The most simple means to connect exhaust system components is the flange connection. For one connection you need two of the offered flanges and one corresponding gasket. Our flanges are made of stainless steel and perfectly even. Length: 125mm Width: 76mm Hole distance: 89mm Thickness: 10mm