Overview

• Round head types are dome shaped with flat bearing surfaces
• They have a higher head height than pan head fasteners
• Slotted drive types are used with flat-blade drivers
• They have one linear slot that runs the length of the head
• Drivers must be centered in the slot during tightening or they will slip out and damage the fastener
• Stainless steel is a strong, corrosion-resistant alloy with excellent resistance to heat
• It is used in high-stress, outdoor and corrosive applications
• Type A screws have sharp points and coarse threads
• They are used to cut threads in drilled or punched holes in thin sheet metal.