Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1143-3 found under Tube Ball Return by Beaver Aerospace. The National Stock Number assigned to this part is 1680007718632, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B1143-3.