Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B85-643 found under by David Whitnack Distributing Inc. The National Stock Number assigned to this part is 4720016620672, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B85-643.