Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number UPA21181-1 found under Cover Assembly Captive Fastener by General Atomics Aeronautical Sys. The National Stock Number assigned to this part is 1560015114676, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like UPA21181-1.