Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 523-057 found under Ring Retaining by Pauli And Griffin Co Inc. The National Stock Number assigned to this part is 5325012860943, 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 523-057.