Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5540-2 found under Aligning Tool Rotating Members by Pico Crimping Tools Co Inc. The National Stock Number assigned to this part is 5120013185599, 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 5540-2.