The Whitworth thread was the world's first national screw thread standard, devised and specified by in 1841. Until then, the only standardization was what little had been done by individual people an. .
The form of a Whitworth thread is based on a fundamental triangle with an angle of 55° at each peak and valley. The sides are at a flank angle of Θ = 27.5° perpendicular to the axis. Thus, if the thread pitch is p, the height of th. .
To simplify matters, the term hexagon is used in this section to denote either bolt head or nut. Whitworth and BSF markings refer to the bolt diameter, rather than the distance ac. .
The (BSF) standard has the same thread angle as the BSW, but has a finer thread pitch and smaller thread depth. This is more like the modern "mechanical" screw and was used for fine machinery. [pdf]
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