Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12A0257-5 found under Press Hydravlic Bol by Southwest Machine And Manufacturing. The National Stock Number assigned to this part is 5120009181719, 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 12A0257-5.