Overview

• Internal tooth washers have serrations on the inside 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
• Stainless steel is a strong, corrosion-resistant alloy with excellent resistance to heat
• It is used in high-stress, outdoor and corrosive applications.