Duro Dyne Super Saber 14187 Self Drilling/Tapping Screw, #8-18, Hex Unslotted Head, Steel, Zinc Plated

Several common methods such as rivets, screws, and spot welding are used to fasten materials to ductwork. Three types of screws are most often used. The first is self-tapping only and requires a hole to be drilled before the screw can be utilized. The others are both self-tapping but also create their own holes. Self piercing screws have very sharp points which act much like a scratch awl in making a small opening in the steel for the threads to engage and work the sheet metal into a coned threaded hole. These work well for light gage steel. Self-drilling screws have an integral drill point which creates a large hole for tapping. This allows the screws to be used on heavy gages of steel. The maximum total thickness of steel that the self-drilling screw can be used with is determined by the drill point.

• Cold heading quality steel wire
• 0.166 to 0.161 in major dia
• 0.122 to 0.116 in minor dia
• Case hardened to rockwell C52-58

IFI 113