Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AM421S4300H262505 PIECE 16 found under Studs And Nuts by Moffitt Lucian Q Inc Sub Of The. The National Stock Number assigned to this part is 5999011963812, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AM421S4300H262505 PIECE 16.