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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. NAS ...
NAS: National Aerospace Standards: Standards maintained by SAE International and widely used in the aerospace manufacturing industries. The "National" formerly implicitly referenced the US, but today NAS and other standards are used globally. Standard hardware for aerospace work sometimes uses the NAS- prefix in the catalog numbers. (See also ...
A business using a part will often use a different part number than the various manufacturers of that part do. This is especially common for catalog hardware, because the same or similar part design (say, a screw with a certain standard thread, of a certain length) might be made by many corporations (as opposed to unique part designs, made by only one or a few).
Typical USA Flat Washer Dimensions USS, SAE, Fender, and NAS washer ID & OD (mm) American National Standard (ANSI) Type B Plain Washers; SAE Flat Washers Type A Plain Washers; USS & SAE Combined Flat Washer Dimensions; Flat Washer Thickness Table Steel Gage Thicknesses, non-metric; Split Lockwashers: Truth vs. Myth Hill Country Engineering
The term fine adjustment screw typically refers to screws with threads from 40–100 TPI (Threads Per Inch) (0.5 mm to 0.2 mm pitch) and ultra fine adjustment screw has been used to refer to 100–254 TPI (0.2 mm to 0.1 mm pitch). These screws are most frequently used in applications where the screw is used to control fine motion of an object.
The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly referred to as a Robertson because it has practically identical drive dimensions and the same colour identification system, but the contemporary square drive socket has parallel sides rather than tapered.
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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.
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