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  2. 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 ...

  3. Nut driver - Wikipedia

    en.wikipedia.org/wiki/Nut_driver

    A nutdriver or nut driver is a hand tool for tightening or loosening nuts and bolts. It essentially consists of a socket attached to a shaft and cylindrical handle and is similar in appearance and use to a screwdriver. [1] They generally have a hollow shaft to accommodate a shank onto which a nut is threaded.

  4. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    In 1913, Woolley and Meredith defined them like Anthony, but gave the following dimensions: hex head cap screws up to and including 7 ⁄ 16 inch (11.1125 mm) have a head that is 316 inch (4.7625 mm) larger than the shank diameter; screws greater than 1 ⁄ 2 inch (12.7 mm) in diameter have a head that is 1 ⁄ 4 inch (6.35 mm) larger than ...

  5. Furniture screw - Wikipedia

    en.wikipedia.org/wiki/Furniture_screw

    Insert nut, a type of en type of threaded insert for wood; Sex bolt, a type of nut with a low shoulder (flange) to provide resistance with little protrusion; T-nut, a nut that can be knocked into the back of a wood plate to provide a screw mounting hole; Wood hanger screw, a screw with machine threads in one end, and wood screw threads in the other

  6. Screwdriver - Wikipedia

    en.wikipedia.org/wiki/Screwdriver

    Robertson, also known as a square, [15] or Scrulox [16] screw drive has a square-shaped socket in the screw head and a square protrusion on the tool. Both the tool and the socket have a taper, which makes inserting the tool easier, and also tends to help keep the screw on the tool tip.

  7. Square thread form - Wikipedia

    en.wikipedia.org/wiki/Square_thread_form

    The greatest advantage of square threads is that they have a much higher intrinsic efficiency than trapezoidal threads (Acme or metric trapezoidal). Due to the lack of a thread angle there is no radial pressure, or bursting pressure, on the nut. This also increases the nut life. [1] The greatest disadvantage is the difficulty in machining such ...

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