Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 991-4-10380-016 found under Screw Machine by G E C Marconi Avionics Ltd. The National Stock Number assigned to this part is 5305996351147, 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 991-4-10380-016.