: Identifies the fastener type or material using a two or three-letter code (e.g., "BJ" for MS20470AD or "BB" for MS20426AD).
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Indicated by "N" (Near side) or "F" (Far side) to show where the manufactured head should rest. AIA/NAS - NAS523 - FASTENER CODE | GlobalSpec : Identifies the fastener type or material using
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Indicates the fastener length , typically measured in 1/16" increments. For example, a "-6" would signify a length of 3/8". Accessing NAS523 PDF Resources