The key types of flanges are the welding neck, long welding neck, slip-on, socket weld, lap joint, threaded and blind flanges. In addition to these standard flanges, some special ones exist, called Weldoflange/Nipoflange and Elboflange, swivelflange, expander/reducer flange, and orifice flanges.

Sometimes a specific engineering requirement may dictate the need for special material and construction type required to produce the Spade and Spacers.