Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 71021 4 found under Strap Carrier Exten by Avon Protection Systems Inc. The National Stock Number assigned to this part is 5340015395587, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 71021 4.