Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 499-020-031 found under Ring Retaining by Interstate Electronics Inc. The National Stock Number assigned to this part is 5325006641663, 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 499-020-031.