machine screw
Also known as: machinery screw
Quick Summary
Screws and screw heads
Screws and screw heads (A) Cap screw, (B) machine screw with oval head, (C) setscrew with hollow head, (D) self-tapping screw, (E) flat-head wood screw, (F) machine screw with Phillips head, (G) lag screw.
A machine screw is a type of screw used for fastening metal parts together. These screws typically have a slotted or socket head and are designed to clamp components when tightened, often by threading into one of the parts or by using a nut. Machine screws are generally smaller than cap screws and bolts and come with various head types, many featuring screwdriver slots. They are distinct from wood screws, which are designed for use in wood, and setscrews, which are used to prevent relative motion between parts.12
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