Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 311-05-SS-440-E found under Screw Assembly Panel by Promptus Electonic Hardware Inc. The National Stock Number assigned to this part is 5305013605997, 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 311-05-SS-440-E.