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2. 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 ...

3. 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 ( major ) diameter, with a head height ...

4. Fastener - Wikipedia

   en.wikipedia.org/wiki/Fastener

   B18.3 Socket Cap, Shoulder, Set Screws, and Hex Keys (Inch Series) B18.6.1 Wood Screws (Inch Series) B18.6.2 Slotted Head Cap Screws, Square Head Set Screws, And Slotted Headless Set Screws (Inch Series) B18.6.3 Machine Screws, Tapping Screws, and Metallic Drive Screws (Inch Series) B18.18 Quality Assurance For Fasteners

5. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   The spline socket drive system was patented in the United States in 1913 by Dwight S. Goodwin [59] and initially produced by the Goodwin Hollow Set Screw Company. [58] Spline socket screws are used in avionics , high reliability applications, cameras, air brakes, construction and farm equipment and astronomy equipment.

6. Allen (brand) - Wikipedia

   en.wikipedia.org/wiki/Allen_(brand)

   An advertisement for Allen safety screws would appear in the 1910 Annual Convention of International Association of Factory Inspectors. [6] In 1922, Allen Manufacturing Company produced sets of tools under the company name "Bay State", suggesting that they may have privately acquired another hardware manufacturer, namely the Bay State Pump Company.

7. 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 ...