Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BBN-0542 found under Ring Retaining by Nash Engineering Company Inc The. The National Stock Number assigned to this part is 5325013678532, 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 BBN-0542.