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Fixing to Metal

self-drilling screws have a hardened drill point that will drill and thread in structural steel and mild steel.

There are two main criteria of a Teks point.

1. The point must be in perfect diameter ratio relationship to the thread, so as to not
　overdrill. This allows the thread to engage in the steel at an acceptable tapping
　torque. The pullout load is also determined by the ratio of the thread diameter
　to the hole diameter.

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2. The point must have a swarf flute longer than the total thickness of the steel 　being drilled. This prevents problems with fastener installation due to swarf 　clogging the flue.

It is important that the drill point has completed drilling the total thickness of the steel before the thread engages.

To choose the correct fastener, it is necessary to select one where the length of the drill point is equal to or greater than the total thickness of the material to be drilled including the air-gap. If the drill point is less than the total thickness of the material and the thread engages, then the fastener can break or become impossible to drive.

	As a rule the correct length screw should have at least 3 threads protruding behind the metal you are fastening to. The table indicates the metal thickness capacity of each gauge size available. When the gauge size has been determined, the length and head style for the intended application would then need to be determined.

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