Throughout the industry the names Anderberg and Truth have stood for reliable engineering and production, as well as precision made products and excellent support services; but above all this, these names stand for quality. This is most evident in our expertly crafted 4-Bar Hinges. Each style of hinge that you will find on the accompanying pages has a variety of sizes and options to choose from. Everything from hinges manufactured with or without stops to varying degrees of opening. A wide range of lengths and thicknesses are also available. Truth 4-Bar Hinges are certified to AAMA 904.1. 4-Bar Hinges have been designed to be used primarily on vents with a lip on the outside edge. 4-Bar Hinges are designed to project the vent out as it pivots to avoid interference between a lipped vent and frame. 4-Bar Hinges are adaptable to both casement and projected window applications.