Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C4BM1749-1 found under Knob by Bombardier Aerospace. The National Stock Number assigned to this part is 5355005428286, and the Federal Supply Class is 5355 Knobs And Pointers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C4BM1749-1.