Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BACS21AE6A4 found under Stud Assembly Turnlock Fastener by The Boeing Company. The National Stock Number assigned to this part is 5325007084987, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BACS21AE6A4.