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British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread. It was used for steel bolts and nuts on and in much of Britain's machinery, including cars, prior to adoption of Unified , and later Metric , standards.
The British Standard Fine (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 [ clarification needed ] and was used for fine machinery and for steel bolts.
Hard bolívar, abbreviated BsF or Bs.F, the currency of Venezuela from 2008 to 2018; Boysetsfire, an American post-hardcore rock band; Bradshaw Army Airfield, with IATA airport code BSF; British Standard Fine, an imperial-unit based screw-thread standard; Building Schools for the Future, a British Government initiative to rebuild schools, from ...
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The Thury thread form had the crests rounded at 1 / 6 p and the roots rounded at 1 / 5 p so the thread angle was close to 47.5° but not exactly. This was simplified in the BA thread definition by defining the thread angle to be 47.5° exactly and the thread form to be symmetrical with a depth of 3 / 5 p.
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BS 811: 1950 provides specifications for British standard cycle threads. [2] Cycle thread in 7 ⁄ 16 and 1 ⁄ 2 inch sizes also come in 20 tpi and 24 tpi options. 1/4" diameter cycle thread nuts and bolts have the same 26tpi as 1/4" BSF, which means that they will fit each other in this diameter only. Traditionally the parts it would be found ...
For a taper thread, it is the diameter at the "gauge length" (plus/minus one thread pitch) from the small end of the thread. The taper is 1:16, meaning that for each 16 units of measurement increase in the distance from the end, the diameter increases by 1 unit of measurement.