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The standard designation for a UTS thread is a number indicating the nominal (major) diameter of the thread, followed by the pitch measured in threads per inch.For diameters smaller than 1 / 4 inch, the diameter is indicated by an integer number defined in the standard; for all other diameters, the inch figure is given.
Below is the historical thread size table, not to be confused with G threads, which are actually in use as British Standard Pipe. For example a G½ (half inch) is 20.955mm in diameter. For example a G½ (half inch) is 20.955mm in diameter.
ISO general-purpose screw threads—Basic profile—Part 2: Inch screw threads: V Thread Form ISO 261:1998: ISO general purpose metric screw threads—General plan: V Thread Form: M6x1 ISO 262:1998: ISO general purpose metric screw threads—Selected sizes for screws, bolts and nuts: V Thread Form ISO 724:1993: ISO general-purpose metric screw ...
Commonly used sizes are 1 ⁄ 8, 1 ⁄ 4, 3 ... The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3 ...
8.2 20.7: 21.1 3 ⁄ 4 ... the thread size; Threads are normally right-hand. For left-hand threads, the letters, LH, are appended.
The thread depth is 0.54125 × pitch. The outermost 1 ⁄ 8 and the innermost 1 ⁄ 4 of the height H of the V-shape are cut off from the profile. The relationship between the height H and the pitch P is found using the following equation where θ is half the included angle of the thread, in this case 30°: [3]