Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 021-317-1 found under Tire Pneumatic Airc by Bf Goodrich Aerospace. The National Stock Number assigned to this part is 2620012888437, and the Federal Supply Class is 2620 Tires And Tubes Pneumatic Aircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 021-317-1.