Overview

• External tooth washers have serrations on the outside diameter that grip both the fastener and workpiece to lock into place
• Pan head types have cylindrical heads with rounded edges and flat bearing surfaces
• Their low head height and large diameter provide increased driving power
• Phillips drive types have a cross-shaped slot and are used with Phillips drivers
• To prevent damage to the fastener head and fastened surface, the drive design forces the driver to cam out when the fastener is sufficiently tightened
• 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.