SELF-DRILLING TEK SCREWS DRILL LENGTH
A self-drilling tip include a drill point to drill a starting hole so the threads of the screw can cut and tap into the material, securing it into place.
Point Length : Teks screw are distinguished by the length of their drill point. They can be either Tek 1, Tek 2, Tek 3, Tek 4, Tek 5 or Tek 7. Tek 7 being the longest drill point.
Sealing washer : A sealing washer will be added when the connection needs to be waterproof, in roofing application per example.
Wings: Also called Reamers, they 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 reach the metal material. Once the wings hit the metal, they snap off.
Dimensions Standard Self Drilling Screws
| Dia. | Thread | Hex Head | Point | Drill Thick. |
|---|---|---|---|---|
| 6 | 20 | 1/4 | 1 | – |
| 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 |
| 10 | 24 | 5/16 | 3 | 0.110 – 0.175 |
| 12 | 14 | 5/16 | 2 | 0.035 – 0.080 |
| 12 | 14 | 5/16 | 3 | 0.110 – 0.175 |
| 12 | 24 | 5/16 | 4 | 0.145 – 0.312 |
| 12 | 24 | 5/16 | 5 | 0.250 – 0.500 |
| 12 | 24 | 5/16 | 7 | 0.500 – 0.750 |
| 14(1/4) | 14 | 3/8 | 3 | 0.110 – 0.220 |
| 14(1/4) | 14 | 3/8 | 4 | 0.145 – 0.312 |
| 14(1/4) | 14 | 3/8 | 5 | 0.250 – 0.500 |
| 14(1/4) | 14 | 3/8 | 7 | 0.500 – 0.750 |