<p>This Architectural Drawing is AutoCAD 2d drawing of Types of bolts in AutoCAD, dwg file. Bolts, as well as screws, are available in a vast variety of head shapes. These heads are made <strong>in order to grip the tools that are used to tighten them</strong>. The most common type of bolt head types includes square, hex, slotted hex washer, and socket cap. The earliest bolt heads in use were the square heads. For more details and information download the drawing file.</p>