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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.
British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, BSCon, and BSCopper.
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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Unlike other major British imperial thread standards (British Standard Whitworth and British Standard Fine) the thread runs at a 60 degrees rather than a 55 degrees angle. All sizes 1 ⁄ 4 inch and larger use 26 threads per inch (tpi), making them similar to 1 mm ISO threads , which are 25.4 per inch and also run at a 60 degrees angle.
An externally threaded fastener that has thread form which prohibits assembly with a nut having a straight thread of multiple pitch length is a screw. (Example: wood screws, tapping screws.) [59] This distinction is consistent with ASME B18.2.1 and some dictionary definitions for screw [60] [61] and bolt. [62] [63] [64]
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 ...
The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [ 1 ] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.