Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-10196 ITEM 19 found under Washer Flat by Mac Gregor Usa Inc. The National Stock Number assigned to this part is 5310014415191, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21-10196 ITEM 19.