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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.
2-1 ⁄ 2 –4: 105: 115: 140: C31–39 ... plain or a coating of insufficient thickness to require over-tapped nuts: C; heavy hex BC; zinc-coated or a coating that ...
The half-angle (between the taper surface and the axis of the pipe) is arctan(1 ⁄ 32) ≈ 1.7899° ≈ 1° 47′. The standard for Nominal Pipe Size (often abbreviated NPS, which should not be confused with the abbreviation NPS for the straight thread form standard) is loosely related to the inside diameter of Schedule 40 series of sizes.
A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25). If the pitch is the normally used "coarse" pitch listed in ISO 261 or ...
Typ. nut sizes Corresponding pipe DN OD Wall (in) ... ISO 228-1:2000 Dimensions, tolerances and designation; ISO 228-2:1987 Verification by means of limit gauges;
The thread pitch increases with diameter in steps specified on a chart. ... 47.2 1.670 42.4 — 1 + 1 ⁄ 4: 2.050 ... British Morris and MG engines from 1923 to 1955 ...