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2. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   A self-tapping screw is a screw that can tap its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding wood screws .

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   The advantage of this screw type over a self-drilling screw is that, if the screw is reinstalled, new threads are not cut as the screw is driven. set bolt: tap bolt, setscrew: A bolt that is threaded all the way to the head. An ASME B18.2.1 compliant set/tap bolt has the same tolerances as an ASME B18.2.1 compliant hex cap screw. set screw ...

5. SK Hand Tools - Wikipedia

   en.wikipedia.org/wiki/SK_Hand_Tools

   The company has a tool line of over 3,500 items including wrenches, ratchets, screwdrivers, tool boxes and air tools. In 2021, SK was acquired by Hangzhou GreatStar Industrial . Jay Leno described the company as "an iconic American brand for decades," [ 2 ] and the company is known for inventing the round-head ratchet wrench .

6. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   Two screws in the stock bear in to indentations on either side of the slit, tending to squeeze the slit closed, whilst a third screw with a tapered tip screws in to the slit forcing it open. Working these three screws against each other adjusts the die. Integrated screws appear to be common in the US but are almost unknown in the UK and Europe.

7. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   Screws, hence screwdrivers, were not used in full combat armor, most likely to give the wearer freedom of movement. [further explanation needed] The jaws that hold the pyrites inside wheellock guns were secured with screws, and the need to constantly replace the pyrites resulted in a considerable refinement of the screwdriver. The tool is more ...