Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W505443S439 found under Screwcaphexagon Head by Ford Motor Company. The National Stock Number assigned to this part is 5305016806241, 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 W505443S439.