10/17/2023 0 Comments Satta king 2016![]() The difference in measurement refers to the fact that the threaded section is thicker. ![]() For this reason, BSF spanners are one size larger than the equivalent BSW, despite the fact that the bolt head is exactly the same size. The 'sizes' of Whitworth spanners refers to the diameter of the threaded stud, and not the bolt head itself: it is not an AF system. The size of the bolt head also increases proportionally. Whitworth set out the thread angle and pitch of a bolt, which increases in a ratio the larger the bolt becomes. Devised by Victorian Industrialist Joesph Whitworth in 1841, it became the World's first standard for fittings, hugely benefitting Britain's Industrial Revolution. The 'Whitworth standards', of which the most common are BSW (British Standard Whitworth) and BSF (British Standard Fine), are a collection of standards based on the Whitworth thread.
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