Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90555-002 found under Ring Retaining by Century Data Systems Inc. The National Stock Number assigned to this part is 5325010721083, 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 90555-002.