Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BN672M4 found under Washer Lock by Bossard Intl Inc. The National Stock Number assigned to this part is 5310014439842, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BN672M4.