Overview

• Machine screws without washers can be used with both flat and lock washers
• 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
• Round head types are dome shaped with flat bearing surfaces
• They have higher head heights than pan head fasteners
• 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.