Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PH20406SS4-40E found under Screw Externally Relieved Body by Promptus Electonic Hardware Inc. The National Stock Number assigned to this part is 5305012631676, 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 PH20406SS4-40E.