Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 520-14122-4 found under Fitting Structural Component Air by Forrest Machining Inc. The National Stock Number assigned to this part is 1560016707008, 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 520-14122-4.