Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CR450 found under Hoist Chain by Duffnorton Co Inc. The National Stock Number assigned to this part is 3950001025600, and the Federal Supply Class is 3950 Winches Hoists Cranes And Derricks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CR450.