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Since 1938, NASC has developed more than 2,600 standards for aerospace fasteners and other mechanical parts. Personnel from the defense services, Defense Industrial Supply Center and Defense Electronics Supply Center participate in the preparation of NAS standards, and liaison is maintained with the FAA, NASA , AIA Canada , and the airlines.
A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
This definition allows ambiguity in the description of a fastener depending on the application it is actually used for, and the terms screw and bolt are widely used by different people or in different countries to apply to the same or varying fastener. In British terminology, a cap screw is a bolt that has threads all the way to the head.
The connection can be made by a variety of different components: anchor bolts (also named fasteners), steel plates, or stiffeners. Anchor bolts transfer different types of load: tension forces and shear forces. [3] A connection between structural elements can be represented by steel columns attached to a reinforced concrete foundation. [4]
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