Came from the era of circa 1890s-1945, when the U.S. Standards in materials science and engineering maintained by SAE International and widely used in the aerospace manufacturing industries.Ī prefix for standard hardware (catalog hardware) ID numbers. The SAE steel grade system was formerly a joint AISI-SAE system. The AISI acronym is commonly seen as a prefix to steel grades, for example, "AISI 4140". Many corporations have such standards, which define some terms and symbols specific to them on the national and international level, ASME standard Y14.38 is probably the most widely used.Ĭommonly used when measuring the corners of a hex drive, such as a hex nut.Ĭommonly used when measuring the flat surfaces of a hex drive, such as a hex nut. Technical standards exist to provide glossaries of abbreviations, acronyms, and symbols that may be found on engineering drawings. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing.
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