fastener
(6) “fastener” means a metallic screw, nut, bolt, or stud having internal or external threads, with a nominal diameter of 6 millimeters or greater, in the case of such items described in metric terms, or ¼ inch or greater, in the case of such items described in terms of the English system of measurement, or a load-indicating washer, that is through-hardened or represented as meeting a consensus standard that calls for through-hardening, and that is grade identification marked or represented as meeting a consensus standard that requires grade identification marking, except that such term does not include any screw, nut, bolt, stud, or load-indicating washer that is— (A) part of an assembly; (B) a part that is ordered for use as a spare, substitute, service, or replacement part, unless that part is in a package containing more than 75 of any such part at the time of sale, or a part that is contained in an assembly kit; (C) produced and marked as ASTM A 307 Grade A, or a successor standard thereto; (D) produced in accordance with ASTM F 432, or a successor standard thereto; (E) specifically manufactured for use on an aircraft if the quality and suitability of those fasteners for that use has been approved— (i) by the Federal Aviation Administration; or (ii) by a foreign airworthiness authority as described in part 21.29, 21.500, 21.502, or 21.617 of title 14 of the Code of Federal Regulations ; (F) manufactured in accordance with a fastener quality assurance system; or (G) manufactured to a proprietary standard, whether or not such proprietary standard directly or indirectly references a consensus standard or any portion thereof;