UTS threads do not usually use the pitch parameter instead a parameter known as threads per inch (TPI) is used, which is the reciprocal of the pitch. For UTS threads, which are single-start threads, it is equal to the lead, the axial distance that the screw advances during a 360° rotation. The pitch P is the distance between thread peaks. the major diameter of a #6 screw is 0.1380 in, approximately 9⁄ 64 in = 0.140625 in). The diameters are sometimes given approximately in fractions of an inch (e.g. The major diameter may be slightly different than the shank diameter, which is the diameter of the unthreaded part of the screw. The minor diameter D min (also known as the root diameter) is the diameter of the screw measured from the inner edge of the threads. The major diameter D maj is the diameter of the screw measured from the outer edge of the threads. The outermost 1⁄ 8 and the innermost 1⁄ 4 of the height H of the V-shape are cut off from the profile. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. UTS threads consist of a symmetric V-shaped thread. Only the commonly used values for D maj and P differ between the two standards.Įach thread in the series is characterized by its major diameter D maj and its pitch, P. Basic profile The basic profile of all UTS threads is the same as that of all ISO metric screw threads. Origins See the "History of standardization" section of the screw thread article. The UTS is currently controlled by ASME/ ANSI in the United States. It has the same 60° profile as the ISO metric screw thread, but the characteristic dimensions of each UTS thread (outer diameter and pitch) were chosen as an inch fraction rather than a millimeter value. It is the main standard for bolts, nuts, and a wide variety of other threaded fasteners used in these countries. The Unified Thread Standard ( UTS) defines a standard thread form and series-along with allowances, tolerances, and designations-for screw threads commonly used in the United States and Canada.
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