Window Screws are, as the name suggest, fastened mostly on windows. Since a window consists of different components, the fastener used in fastening a window screw also varies from material to areas the screw is fastened.
The most common aspect of a window screw is the head. Since Window Screws are made to fasten on the exterior windows, a non-protruding head, such as the flat countersunk head, would be best for the job.
Most Window Screws also has nibs under the head to create better fixture on the window. Thread types of the Window Screw ranges from different kinds of fine and coarse threads.
And lastly, Window Screws comes in both self-drilling and self-tapping points. It will really depend on whether the Window Screw is used to fasten wood, metal, or both.
The self-drilling point on a Window Screw is more likely to be rounded rather than the normal flat self-drilling points.
The common coatings for Window Screws are zinc and yellow zinc.