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Self-Drilling (Tek) Screw
These screws feature a self-drilling tip. The drill point can drill a starting hole so the threads of the screw can cut into the material, securing it into place.
Other Names: Drill Point Screw, Tek Screw
Point Length: Tek screws are often distinguished by the length of their drill point. The length determines how thick of material the screw can drill through. They can be #2, #3, #4, or #5. #5 denotes the longest point.
Sealing Washer: A sealing washer is sometimes added to make the connection water proof when installed
Wings: These are added when attaching wood to metal. They are small portions of metal just above the drill point that make a wider hole in the wood so the threads do not engage until they hit the metal material. Once the wings hit the metal, they snap off.
Dimensions #2, #3 Points
| Dia. | Thread | Hex Head | Point | Drill Thick. |
|---|---|---|---|---|
| 4 | 24 | - | 2 | 0.035 - 0.080 |
| 6 | 20 | 1/4 | 2 | 0.035 - 0.090 |
| 8 | 18 | 1/4 | 2 | 0.035 - 0.100 |
| 10 | 16 | 5/16 | 2 | 0.035 - 0.110 |
| 10 | 16 | 5/16 | 3 | 0.110 - 0.175 |
| 12 | 14 | 5/16 | 3 | 0.110 - 0.210 |
| 1/4 | 14 | 3/8 | 3 | 0.110 - 0.220 |
Dimensions #4, #5 Points
| Dia. | Thread | Hex Head | Point | Drill Thick. |
|---|---|---|---|---|
| 12 | 24 | 5/16 | 4 | 0.145 - 0.312 |
| 12 | 24 | 5/16 | 5 | 0.250 - 0.500 |
| 1/4 | 28 | 3/8 | 4 | 0.145 - 0.312 |
| 1/4 | 28 | 3/8 | 5 | 0.250 - 0.500 |