Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5B1-03389 found under Spring Special by Oldenburg Group Incorporated. The National Stock Number assigned to this part is 5360012818875, and the Federal Supply Class is 5360 Coil Flat Leaf And Wire Springs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5B1-03389.