Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 509441-48 found under Screw Cap Socket Head by Apollo Aerospace Components Llc. The National Stock Number assigned to this part is 5305012996596, 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 509441-48.