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  2. Self-tapping screw - Wikipedia

    en.wikipedia.org/wiki/Self-tapping_screw

    Self-tapping screws can be divided into two classes: [3] those that displace material (especially plastic and thin metal sheets) without removing it, known as "thread-forming" self-tapping screws, and self-tappers with sharp cutting surfaces that remove the material as they are inserted, termed "thread-cutting" self-tapping screws. Thread ...

  3. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...

  4. Pentalobular screw thread - Wikipedia

    en.wikipedia.org/wiki/Pentalobular_screw_thread

    A pentalobular screw thread is a form of self-forming thread used for screws. Self-forming screws are used in ductile materials, such as aluminium and plastics. Self-tapping screws are widely used for driving into sheet metal or plastics and forming their own thread. They may be either self-drilling, forming their own hole through unbroken ...

  5. Category:Screws - Wikipedia

    en.wikipedia.org/wiki/Category:Screws

    Self-forming thread; Self-tapping screw; Set screw; Square thread form; T. Tap and die; Thread angle; List of thread standards; Thread-locking fluid; Torque ...

  6. Screw - Wikipedia

    en.wikipedia.org/wiki/Screw

    An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. (Example: wood screws, tapping screws.) [59] This distinction is consistent with ASME B18.2.1 and some dictionary definitions for screw [60] [61] and bolt. [62] [63] [64]

  7. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is an inclined plane wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread.

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