Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 343-521-68PC1 found under Sheave Assembly by National Steel And Shipbuilding. The National Stock Number assigned to this part is 2020008505343, and the Federal Supply Class is 2020 Rigging And Rigging Gear. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 343-521-68PC1.