Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A156.4 TYPE C02012 SIZE 4 found under Closer Door by American National Standards Inst. The National Stock Number assigned to this part is 5340000000059, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A156.4 TYPE C02012 SIZE 4.