| Diameter - Thread Size | : | #8-15 |
| Drive Size | : | 1/4 in |
| Finish | : | Zinc Plated |
| Hardness | : | C55 |
| Head Type | : | Slotted Hex |
| Material | : | Steel |
| Measurement System | : | Imperial |
| Point Type | : | Twin Lead |
| Thread Length | : | 1-1/2 in |
| Type | : | Threaded |
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.
Duro Dyne® Super Saber® Self-Piercing Screw, Threaded, Measurement System: Imperial, #8-15 Thread, Slotted Hex Head, Steel, Zinc Plated, Twin Lead Point, 1/4 in Drive, 1-1/2 in Thread Length, C55 Hardness
- Cold heading quality steel wire
- Case hardened to rockwell C55 minimum
- Twin lead point (two continuous threads)
- 0.168 to 0.162 in major dia
- 0.123 to 0.116 in minor dia