Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1R4289 found under Channel Structural by Drs C3 And Aviation Company. The National Stock Number assigned to this part is 9520016110838, 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 1R4289.