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2. Internal wrenching nut - Wikipedia

   en.wikipedia.org/wiki/Internal_wrenching_nut

   Internal wrenching nut. An internal wrenching nut, (also known as an Allenut [1] or Allen nut ), is a cylindrical nut that is internally threaded on one side and has an Allen socket on the other side; the outside of the nut is smooth or has knurling on it. The Allen socket may be 6 point or 12 point (also known as a double hex socket). They are ...

3. Socket wrench - Wikipedia

   en.wikipedia.org/wiki/Socket_wrench

   Spark plug sockets, oxygen sensor sockets, ball joint sockets, axle nut sockets, etc. fit in this category. A much rarer form of socket is the penta socket, or 5 point socket, used with things such as, Telephone lines, waterworks, and certain vehicles. By far the most common use for them is with water meters, which have 5 sided bolts or nuts.

4. Torx - Wikipedia

   en.wikipedia.org/wiki/Torx

   Torx (pronounced / tɔːrks /) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 [1] by Camcar Textron. [a] A popular generic name for the drive is star, as in star screwdriver or star bits. The official generic name, standardized by the International Organization for Standardization as ...

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   A 12-point screw drive uses two overlapped hexagon shapes, one rotated by 30°. Standard 12-point hex socket bits and wrenches fit these screws. The screw heads are typically flanged, and may fit into standard Allen hex socket cap screw counterbores molded or machined into parts to be fastened.

6. Wrench - Wikipedia

   en.wikipedia.org/wiki/Wrench

   Wrench. A set of metric spanners or wrenches, open at one end and box/ring at the other. These are commonly known as “combination” spanners. A wrench or spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts —or keep them from turning.

7. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   A screw thread is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge 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. A screw thread is the essential feature of the screw as a simple machine ...