| Drive Size | : | 1/4 in |
| Drive Type | : | Slotted Hex |
| Finish | : | Zinc |
| Head Size | : | 1/4 in |
| Head Type | : | Hex Washer |
| Material | : | Sheet Metal |
| Thread Length | : | 1/2 in |
| Thread Size | : | #7 |
| Thread Type | : | Double |
Malco's Zip-in® screws are known for their superior quality and is considered by many for being the best screw choice for HVAC metal duct fastening. A unique thread design and quality controlled manufacture spell the Zip-in® sheet metal screw difference. Zip-in's® are made with a sophisticated heat treat process which allows the screw to taper to a fine, sharp point without sacrificing critical point strength. A single starting thread is formed down to the very tip of the point and is the source of Zip-in's® penetrating power. A second thread above the point engages after initial penetration and drills in the screw double fast. Malco's Zip-in® screws are faster driving, with a greater capacity for fastening heavier gauges of sheet metal than any other self-piercing type.
Malco® Self-Piercing Screw, #7 Thread, Double Thread, 1/4 in Head, Hex Washer Head, 1/4 in Drive, Hex, Slotted Drive, 1/2 in Thread Length, Sheet Metal, Finish: Zinc
- Undercut indented hex washer slotted head
- Burr-free
- Full 1/4 in (No 8) head will not strip out of hex driver opening
- One 1/4 in hex driver accommodates all sizes
- Undercut - always seats flush
- Combination lead double thread design
- Single starting thread machined down to very tip of screw point
- Instantly penetrates and engages in heavy gauge sheet metal and layered light gauge
- Consistent hard point
- Quality controlled heat treat
- Sharp tapered point will not mushroom or break
- No walking