Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12Z1 found under Screw Cap Hexagon Head by Adams Nut And Bolt Co Inc. The National Stock Number assigned to this part is 5305016521277, 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 12Z1.