Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C43-18 found under Spring Spiral Torsion by Dresser Industries Inc. The National Stock Number assigned to this part is 5360003186622, 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 C43-18.