Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1231-1100 found under Screwmachine by Columbus Jack Corporation. The National Stock Number assigned to this part is 5305016897951, 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 1231-1100.