Search results
Results from the WOW.Com Content Network
BSF was developed by R. E. B. Crompton, and his assistant George Field. [1] [when?] BSF threads use the 55 degree Whitworth thread form. It was introduced by the British Engineering Standards Association in 1908. [2] The table provides BSF sizes, the threads per inch and spanner jaw sizes. The BSC column indicates where BSF and BSC threads match.
The Leica Thread-Mount used on rangefinder cameras and on many enlarging lenses is 1 + 17 ⁄ 32 in by 26 turns-per-inch Whitworth, an artifact of this having been developed by a German company specializing in microscopes and thus equipped with tooling capable of handling threads in inches and in Whitworth.
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.
For example, “.750-10 UNC-2A” is male (A) with a nominal major diameter of 0.750 inches, 10 threads per inch, and a class-2 fit; “.500-20 UNF-1B” would be female (B) with a 0.500-inch nominal major diameter, 20 threads per inch, and a class-1 fit. An arrow points from this designation to the surface in question. [19]
Retrieved from "https://en.wikipedia.org/w/index.php?title=British_standard_fine_thread&oldid=512152321"
Pipe Threads, General Purpose (Inch) Pipe Thread Form ANSI B1.20.3-1976 (R2013) Dryseal Pipe Threads (Inch) Pipe Thread Form ASME B1.20.7-1991 (R2013) Hose Coupling Screw Threads - Inch: Pipe Thread Form ASME B1.21M-1997 (R2013) Metric Screw Threads - MJ Profile: V Thread Form BS 84: Tables of BS Whitworth, BS Fine and BS Pipe Threads: V Thread ...
Earnings per share guidance was updated to a range of $6.10 to $6.25, compared to a previous range of $6.10 to $6.35. Barry said the company is at a turning point, as "layers of pressures that ...
The thread form follows the British Standard Whitworth standard: Symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane) One-sixth of this sharp V is truncated at the top and the bottom; The threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks where r ≈ 0 ...