Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RRN56SCD found under Ring Retaining by U S Industries Inc. The National Stock Number assigned to this part is 5325004611620, 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 RRN56SCD.