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2. British Association screw threads - Wikipedia

   en.wikipedia.org/wiki/British_Association_screw...

   The British Standards Institution recommends the use of BA sizes in favour of the smaller British Standard Whitworth (BSW) and British Standard Fine (BSF) thread screws (those below 1 ⁄ 4 inch). [4]: 4 Generally, the 0BA size was dropped in place of 7 ⁄ 32 inch BSF in assemblies that included larger fasteners, however, in smaller equipment ...

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. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   A machine screw is a small fastener less than 1 ⁄ 4 inch (6.35 mm) in diameter similar to a bolt, but which usually has a recessed drive type (slotted, Phillips, etc.) on its head to allow turning it with a screwdriver. Machine screws are threaded the entire length of the shank, and are intended to screw into a pre-formed thread in either a ...

5. AC power plugs and sockets: British and related types

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets:...

   Comparison of (top) the BS 4573 shaver plug with its parallel 5.1 mm pins that are 16.66 mm apart with the Europlug with its 4 mm pins converging slightly from a distance of 18.6 mm apart UK shaver supply unit marked with shaver symbol. Accepts BS 4573, Europlugs, US Type A, and Australian two-pin plugs.

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7. British Standard Whitworth - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Whitworth

   The Whitworth thread was the world's first national screw thread standard, [1] devised and specified by Joseph Whitworth in 1841. Until then, the only standardization was what little had been done by individual people and companies, with some companies' in-house standards spreading a bit within their industries.