Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4E20012-105B found under Strip Joining by Triumph Fabrications Fort Worth. The National Stock Number assigned to this part is 1560012080936, 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 4E20012-105B.