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2. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Inch-sized wood screws in the U.S. are defined by ANSI-B18.6.1-1981(R2003), while in Germany they are defined by DIN 95 (Slotted raised countersunk (oval) head wood screws), DIN 96 (Slotted round head wood screws), and DIN 97 (Slotted countersunk (flat) head wood screws). Security head screw: These screws are used for security purposes and ...

3. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...

4. 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.

5. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   A machine screw or bolt is usually a smaller fastener (less than 1 ⁄ 4 inch (6.35 mm) in diameter) threaded the entire length of its shank that usually has a recessed drive type (slotted, Phillips, etc.), usually intended to screw into a pre-formed thread, either a nut or a threaded (tapped) hole, unlike a wood or self-tapping screw. Machine ...

6. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   The tool used to drive a slotted screw head is called a standard, common blade, flat-blade, slot-head, straight, flat, flat-tip, [6] or "flat-head" [7] screwdriver. This last usage can be confusing, because the term flat-head also describes a screw with a flat top, designed to install in a countersunk hole. Before the development of the newer ...

7. Self-tapping screw - Wikipedia

   en.wikipedia.org/wiki/Self-tapping_screw

   The countersunk head has a Pozidriv recess. 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.