Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1220-4140 ITEM 11 found under Angle Structural by Huntington Ingalls Incorporated. The National Stock Number assigned to this part is 9520012697398, and the Federal Supply Class is 9520 Structural Shapes. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1220-4140 ITEM 11.