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British Taps-What You Need to Know 55 degree Whitworth Thread Form. Whitworth Pipe Threads are used almost exclusively by countries that use the Metric system. British Standard pipes are known as Parallel, Straight, BSP, or BSPF The various symbols are: BSP, BSPP, BSSPI, BSPF, BSPG, PS, R, G.   British Standard Pipe that are tapered (BSPT) are also known as: British Standard Taper pipe or pipe Taper or Concial Thread The taper is ¾” taper per foot or 1 in 16 on the diameter.   The many symbols are: BSPT, BSPTr, PT, KR, Rc  

There are three established Classes of Thread, designated in the Unified series by adding “A” for screws and “B” for nuts (or other internal threads) to show definite limits and tolerances. Class lB Thread is that in which a 1 A screw can be run in readily for quick and easy assembly. The hole is classified as 1 B. The fit is 1 B Thread, and rarely used in modern metalworking. Class 2B Thread consists of a 2A screw in a 2B hole. This 2B Thread has wide application, accommodates plating, finishes, and coating to a limited extent and, therefore,...

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