Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5523A38 found under Adapter Socket Wrench by Raytheon Australia Pty Ltd. The National Stock Number assigned to this part is 5120001445207, 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 5523A38.