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.
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 |