Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BS4-1409PC27 found under Setscrew by Warren Pumps Llc. The National Stock Number assigned to this part is 5305002071398, 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 BS4-1409PC27.