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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 ...
IEC metric screw sized connectors is a family of electrical connectors defined by IEC that are named according to their ISO metric screw thread, namely M5, M8 and M12. [1] The number gives their outer screw thread diameter in millimeters as with the identically named screws.
Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.
Sizes are: M4, M5, M6, (M7), M8, (M9), M10, (M11), M12, (M13), M14, (M15), M16, (M17) and M18 (the sizes in parentheses are less commonly used, but they do exist). Despite the similar naming scheme to metric fasteners, there is no correlation between the name of the size and the dimensions of the tool. Some sizes (at least M14, M16, M18) are ...
M12 bolt, a size of ISO metric screw thread; M12 connector, a size of IEC metric screw sized electrical connector; Mathieu group M 12, in the mathematical field of group theory; Magic 2012, the thirteenth core set in Magic: The Gathering; S-mount (CCTV lens), a CCTV lens mount using a M12x0.5 thread; M12, a difficulty grade in mixed climbing
The table below shows dimensions of metric spanners for selected sizes of metric threads. [2] Note that with ISO 272 1982 the width across flats for M10, M12, M14 and M22 were changed from 17, 19, 22 and 32 mm respectively to the current standard.
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It uses a male metric M12 thread with 0.5 mm pitch on the lens and a corresponding female thread on the lens mount. S-mount lenses are often called "M12 lenses" due to the ISO metric screw thread designation of the lens's thread, M12 × 0.5.