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In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread [10] but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters.
Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified Miniature Screw Threads: V Thread Form: 0.60 UNM ANSI/ASME B1.11-1958 (R2016) Microscope Objective Thread: V Thread Form ASME B1.13M-2005 (R2015) Metric Screw Threads: M Profile ...
Acme thread [6] 29° ASME/ANSI B1.5-1988 [7] Metric trapezoidal threads [1] Tr 30° DIN 103 Buttress threads [6] S 45° DIN 2781 German buttress threads [6] S 30° DIN 513 Square threads [1] Sq 0° (parallel) ? Panzergewinde, "steel conduit thread" Pg 80° DIN 40430 British Association (BA) thread: BA 47° 30' = 47.5° BS 93:2008 Löwenherz ...
Original file (SVG file, nominally 450 × 232 pixels, file size: ... English: ANSI 45°/7° buttress thread form. Based on Machinery's Handbook 26th Ed., pp. 1819-1820.
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 ...
The pitch diameter of a thread is measured where the radial cross section of a single thread equals half the pitch, for example: 16 pitch thread = 1 ⁄ 16 in = 0.0625 in the pitch actual pitch diameter of the thread is measured at the radial cross section measures 0.03125 in.
This is most easily described for a square or buttress thread as the thread angle is 0 and has no bearing on the calculations. The unwrapped thread forms a right angle triangle where the base is π d m {\displaystyle \pi d_{\text{m}}} long and the height is the lead (pictured to the right).
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.