Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12A0389-3 found under Brake Releasing Too by Southwest Machine And Manufacturing. The National Stock Number assigned to this part is 5120000187889, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 12A0389-3.