Overview

• Hex drive types have six uniform sides that allow fast rotation and easy adjustment
• They are driven by wrenches or sockets and are ideal for limited-clearance applications
• Hex head types have flat bearing surfaces, sharp corners and six uniform sides
• They are used with flat washers and are tightened with wrenches in limited-clearance applications
• Steel is strong and durable but less corrosion resistant than stainless steel
• To improve its resistance to corrosion, it may receive additional finishes and coatings
• Type A screws have sharp points and coarse threads
• They are used to cut threads in drilled or punched holes in thin sheet metal.