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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 .
BS 93:1951 — Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A. BS 93:2008 — British Association (B.A.) screw threads — Requirements The angle of the thread is 47.5° [ 4 ] : 2 and the depth of thread is 0.6 times the pitch with rounded tops and bottoms.
A screw thread is an inclined plane wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. More screw threads are produced each year than any other machine element. [1] Threads are generally produced according to one of the many standards of thread systems.
In 1841, Joseph Whitworth created a design that, through its adoption by many British railway companies, became a standard for the United Kingdom and British Empire called British Standard Whitworth. During the 1840s through 1860s, this standard was often used in the United States as well, in addition to myriad intra- and inter-company standards.
BS 92 Screw threads, British Standard Whitworth and their tolerances; BS 93 Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A. BS 94 Watertight glands for electric cables; BS 95 Tables of Corrections to Effective Diameter required to compensate Pitch and Angle Errors in Screw Threads of ...
Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%. Usually thread depths of 60% to 75% are desired.
British Standard Brass or British Brass Thread is an imperial unit based screw thread. It adopts the Whitworth thread form with a pitch of 26 threads per inch and a thread angle of 55 degrees for all diameters. [1] It is often wrongly called British Standard Brass but is not actually covered by a British Standard.
Pages in category "Thread standards" The following 16 pages are in this category, out of 16 total. ... British Standard Whitworth; Buttress thread; I. ISO metric ...