![]() In order that a locknut may fit loosely on the externally threaded part, an allowance equal to the "increase in pitch diameter per turn" is provided, with a tolerance of 1 1/2 turns for both external and internal threads. Tap size and recommended drill bit size are laser-etched on each tool for easy identification. The locknut thread is established on the basis of retaining the greatest possible amount of metal thickness between the bottom of the thread and the inside of the pipe. The tap size chart provides a list of standard size taps. The major diameter of the external thread has been calculated on the basis of a truncation of 0.10825 p, and the minor diameter of the internal thread has been calculated on the basis of a truncation of 0.21651 p, to provide no interference at crest and root when product is gaged with gages made in accordance with the Standard. The minor diameters of external threads and major diameters of internal threads are those as produced by commercial straight pipe dies and commercial ground straight pipe taps. These theoretical diameters result from adding the depth of the truncated thread (0.666025 x p) to the maximum pitch diameters, and it should be understood that commercial pipe will not always have these maximum major diameters. 130 135 Straight Specialty Metals COTS RoHS 3 Compliant REACH (EC 235 Compliant REACH (EC (, Compliant REACH (EC (, 224 Compliant '. Then compare the length needed to a standard taper chart (Machinery's Handbook or on line resource). The major diameter of the external thread is usually determined by the diameter of the pipe. Use a 1-2-3 block and caliper or other means to measure the pin diameters at 1' separation points then calculate the taper per inch. A form of taper pin that precedes these standards is the clock pin, used to accurately and repeatably. For example, a 2 mm taper pin reamer has a 1.9 mm small end (2 mm nominal size) and a 2.86 mm large end. Metric taper reamers are designated by the small diameter. ![]() For ANSI Standard Straight Pipe Thread the major and the minor diameters of the internal thread and the minor diameter of the external thread vary with the pitch diameter. Taper pin reamers are designed to prepare the hole for taper pins.
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