Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 538549-1039 found under Ring Retaining by Raytheon Company. The National Stock Number assigned to this part is 5325010460410, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 538549-1039.