Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1821 found under Tape Textile by Bally Ribbon Mills. The National Stock Number assigned to this part is 8315015238571, and the Federal Supply Class is 8315 Notions And Apparel Findings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1821.