Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1N1-4D-ZZ found under Screw Sight Base by Milkor Usa Inc. The National Stock Number assigned to this part is 5305015365468, 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 1N1-4D-ZZ.