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The major diameter D maj is the diameter of the screw measured from the outer edge of the threads. The minor diameter D min ... Example: #6-32 UNC 2B (major diameter ...
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.
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 ...
Thread density Thread pitch Minor diameter 75% tap drill size (in) ... 32 7 ⁄ 8: 1.480 37.6 1.300 ... These pipe thread designations do not refer to any thread ...
Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter.. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
Thread pitch Major diameter Minor diameter Gauge length Tapping drill R 95% G 80% (in) (in −1) (mm) (in) (mm) (in) ... 5 ⁄ 32: 4.0 8.6: 8.8 1 ...
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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 ...