Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R666 found under Blade Lower by Rotex Punch Company Inc. The National Stock Number assigned to this part is 3445005399537, and the Federal Supply Class is 3445 Punching And Shearing Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R666.