Machine screws are specialized screws for lighter assemblies and non-structural machine parts.
Wood screws have coarse threads and are for either pre-drilled or non-drilled use.
Thread Cutting Screws
Self Drilling Teks Screws
Self-drilling "Teks" Screws have a point that is similar in shape to a drill bit; this cuts a hole in the substrate. The external threads of the screw create internal threads in the substrate.
Drywall screws are primarily for use in drywall and ceiling applications.
Drive screws have coarse, steep threads, and can be quickly inserted with the help of their pilot points and the strike of a hammer or mallet. They are often used in sheet metals, castings, and plastics.
Hanger bolts are used to join metal and wood parts together. The finer external threads attach to a metal side with internal threads; the coarse threads are screwed into a wooden substrate
Stove bolts are general bolts, most often used in stoves. The assembly consists of a screw and a 4-sided bolt. Often used in smaller diameter-holes, in a large variety of assemblies.
Thumb screws are for lighter assemblies; the screws can be tightened or removed by hand.
"Sems" have a broad head to distribute the attachment pressure over a larger surface area. Serrated options increase friction.
Weld screws are designed to stay in place; they are held in place by an integrated spot-weld material.