Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 128131A found under Screw Cap Hexagon Head by E C A Etablissement Central. The National Stock Number assigned to this part is 5305011679408, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 128131A.