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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. Selfpiercing 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 wellfor light gage steel.
Duro Dyne® Self-Piercing Point Screw, SAC Series, 1/2 in Overall Length, 1/4 in Head, Slotted Hex Head, #8 Drive, Zinc-Plated
| Correct Item Group | : | Fasteners & Hardware |
| Drive Size | : | #8 |
| Drive Type | : | Slotted |
| Finish | : | Zinc-Plated |
| Head Size | : | 1/4 in |
| Head Type | : | Slotted Hex |
| Material | : | Steel |
| Overall Length | : | 1/2 in |
| Point Type | : | Self-Piercing |
| Series | : | SAC Series |
| Thread Size | : | #8 |