Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1680-318-1 found under Boot Dust And Moisture Seal by Mechanical Products Co. The National Stock Number assigned to this part is 5340016265256, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1680-318-1.