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  2. Unified Thread Standard - Wikipedia

    en.wikipedia.org/wiki/Unified_Thread_Standard

    The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. The major diameter still extends to within ⁠ 1 / 8 ⁠ H of the theoretical sharp V , but the total depth of the thread is reduced 4% from ⁠ 5 / 8 ⁠ H = ⁠ 5 / 8 ⁠ cos(30°) P ≈ 0.541 P to 0.52 P . [ 5 ]

  3. Screw thread - Wikipedia

    en.wikipedia.org/wiki/Screw_thread

    The minor diameter is the lower extreme diameter of the thread. Major diameter minus minor diameter, divided by two, equals the height of the thread. The minor diameter of a nut is its inside diameter. The minor diameter of a bolt can be measured with go/no-go gauges or, directly, with an optical comparator.

  4. ISO metric screw thread - Wikipedia

    en.wikipedia.org/wiki/ISO_metric_screw_thread

    Because only 5 ⁄ 8 of this height is cut, the difference between major and minor diameters is 5 ⁄ 4 × 0.8660 × P = 1.0825 × P, so the tap drill size can be approximated by subtracting the thread pitch from the major diameter. In an external (male) thread (e.g. on a bolt), the major diameter D maj and the minor diameter D min define ...

  5. List of thread standards - Wikipedia

    en.wikipedia.org/wiki/List_of_thread_standards

    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: V Thread Form ASME B1.15-1995 (R2003) Unified Inch Screw Threads (UNJ Thread Form) V Thread Form ASME B1.20.1-2013: Pipe Threads, General Purpose (Inch) Pipe ...

  6. British Association screw threads - Wikipedia

    en.wikipedia.org/wiki/British_Association_screw...

    The pitch diameter of the thread is simply OD − 0.6p and the minor diameter is OD − 1.2p. The thread angle is different from that used by Whitworth (55°), US Unified threads (60°) and ISO Metric (60°) so BA fasteners are not properly interchangeable with Whitworth or metric ones even when the pitch and diameter are similar enough that ...

  7. Trapezoidal thread form - Wikipedia

    en.wikipedia.org/wiki/Trapezoidal_thread_form

    The minimum diameter (within tolerance) at the crest of the internal thread (called the min. minor diameter of internal thread) is that of the basic thread form and equals the nominal diameter minus twice the basic thread height (i.e. D − P).

  8. ISO 965 - Wikipedia

    en.wikipedia.org/wiki/ISO_965

    ISO 965 (ISO general purpose metric screw thread—tolerances) is an International Organization for Standardization (ISO) standard for metric screw thread tolerances. [1] It specifies the basic profile for ISO general purpose metric screw threads (M) conforming to ISO 261 .

  9. File:ISO and UTS Thread Dimensions.svg - Wikipedia

    en.wikipedia.org/wiki/File:ISO_and_UTS_Thread...

    Also shown is the location rounding permissible in internal (dark grey, top) and external (light grey, bottom) threads. Key. P: Pitch; H: Thread height; D maj: Major diameter; D min: Minor diameter; D p: Effective pitch diameter; Do not scale from this drawing. Date: 16 January 2008: Source: Own work using: Inkscape: Author: Inductiveload ...