Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 63J52121-2 found under Beam Hoisting by San Antonio Air Logistics Center. The National Stock Number assigned to this part is 3940004409132, and the Federal Supply Class is 3940 Blocks Tackle Rigging And Slings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 63J52121-2.