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  2. Socket wrench - Wikipedia

    en.wikipedia.org/wiki/Socket_wrench

    For example, a 14-inch to 3 ⁄ 8-inch adapter allows sockets with 14-inch drive holes to attach to a 3 ⁄ 8-inch ratchet, and so on. Universal joints are two articulated socket joints (about 1 inch (25 mm) long) combined at a right angle, that allow a bend in the turning axis of the wrench and socket. They are used with extensions ...

  3. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    1.8: 4 flutes 0.216 OS 5.5: 6 flutes 0.072 1.8: 6 flutes 0.251 6.4: 6 flutes ... The spline socket drive system was patented in the United States in 1913 by Dwight S ...

  4. 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 ...

  5. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times that of the screw shank diameter, with a head height equal to the ...

  6. Hex key - Wikipedia

    en.wikipedia.org/wiki/Hex_key

    The idea of a hex socket screw drive was probably conceived as early as the 1860s to the 1890s, but such screws were probably not manufactured until around 1910. Rybczynski (2000) describes a flurry of patents for alternative drive types in the 1860s to the 1890s in the U.S., [2] which are confirmed to include internal-wrenching square and triangle types (that is, square and triangular sockets ...

  7. Torx - Wikipedia

    en.wikipedia.org/wiki/Torx

    A security Torx L-key and fastener with holes for a safety pin to hinder disassembly with an ordinary Torx key. A Torx T8 screw head on a hard disk drive.. Torx (pronounced / t ɔːr k s /) is a trademark for a type of screw drive characterized by a 6-point star-shaped pattern, developed in 1967 [1] by Camcar Textron.