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Used in concrete, brick or block. A quick and easy way to fasten in light to medium duty applications. A pilot hole is required and a hammer drill is recommended for ease of installation.
Lag screws are used to connect heavy lumber or other heavy materials that are bearing an intense load.
A straight fastener with external threads designed to go through a hole that is pre-tapped to form a mating thread for the screw. ... Stainless steel machine screws are used in applications which require general atmospheric corrosion resistance, in food processing machinery and refrigeration equipment.
Self drilling screws, also known as Tek screws, are fasteners with a special pointed end style that allows them to penetrate thin materials without a starting or pilot hole
Self piercing screws are also known as zip, needlepoint, saber point, sprint point, speed point or twinfast screws. They are essentially self tapping screws with a very sharp point that can pierce through thin gauge sheetmetal.
A self-tapping screw is a screw that can tap its own hole as it is driven into the material. For hard substrates such as metal or hard plastics, the self-tapping ability is often created by cutting a gap in the continuity of the thread on the screw, generating a flute and cutting edge similar to those on a tap.
Thread cutting screws are generally for applications where disruptive internal stresses are undesirable or where excessive driving torque would be encountered with thread forming screws. The point of the screw has been formed with a cut of varying types for specific applications.