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CMT Engineering Ltd, Corngreaves Road
Cradley Heath, West Midlands
B64 7DG, United Kingdom

BSP threads to ISO 7.1 (Formerly BS21)

A technical drawing comparing internal parallel threads (Rp) and external taper threads (R). The diagram illustrates the cross-sections of both thread types, with the taper of the external thread specified as 1 in 16 on diameter.
A table of thread dimensions, including nominal bore, minimum and maximum inside diameters, approximate outside diameter of fitting, basic length of useful thread, number of threads per inch, and pitch for both internal parallel threads (Rp) and external taper threads (R).