Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BACS21EE4W found under Stud Assembly Turnlock Fastener by Alcoa Fastening Systems Ltd. The National Stock Number assigned to this part is 5325004493026, 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 BACS21EE4W.