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English: The engineering symbol for "down" or hole depth. Date: 29 December 2009: Source: Own work: Author: Wizard191: Licensing. Public domain Public domain false false:
depth, deep, down: Defines the depth of a feature. ⌀ [2] diameter: Diameter of a circle. In a feature control frame , the ⌀ symbol tells you that the tolerance zone for the geometric tolerance is cylindrical. Abbreviations for "diameter" include ⌀, DIA, and D. D: diameter; delta: Abbreviations for "diameter" include ⌀, DIA, and D.
The Unicode symbol for HOLE, U+1F573, was approved in 2014 as part of the Miscellaneous Symbols and Pictographs chart in Unicode 7.0, [27] and was part of Emoji 1.0, published in 2015. [28] As pictorial representations for emoji are platform-dependent, Emojipedia shows images of the hole symbol as depicted on various platforms. [29]
The simplest dimensioning system just specifies distances between points (such as an object's length or width, or hole center locations). Since the advent of well-developed interchangeable manufacture , these distances have been accompanied by tolerances of the plus-or-minus or min-and-max-limit types.
English: An example of geometric dimensioning and tolerancing (GD&T) of a hole. Explanation: the cross signifies a position tolerance; the tolerance is 0.02 mm ; the position is in reference to the datum planes A and B.
In machining, a counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level of a workpiece's surface.
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Z-44's total measured depth is 12,376 metres (40,604 ft). However, ERD wells are more shallow than the Kola Borehole, owing to a large horizontal displacement. In July 2023, China began drilling deep boreholes, one at the Sichuan Basin expected to reach 10,520 metres (34,510 ft) into the ground and the other at the Tarim Basin with a planned ...