It is trivial to say that no one wants any error, and that everyone wants uniform perfection but in the real world, it almost never happens. The threshold of defectiveness that is allowable in a group of parts. (See also MS- and NAS.)Īnd the many standards that it issues, for example, ANSI Z87.1. DOD and military to do less of it (as explained at United States Military Standard > Origins and evolution), although many MIL standards are still current. Today industry and ISO also do a lot of this standardization specification, freeing the U.S. Army and Navy were leading the way on product standardization for logistics improvement, yielding the United States Military Standards system. 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'. Example would be the top of a coffee table to the shag of the carpet, not where the bottom of the tables feet dig in. Commonly 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.Ī dimension that establishes a distance away from the finished floor.
