Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SY4S-51F1 found under Spring Helical Exte by Idec Corporation. The National Stock Number assigned to this part is 5360013309576, 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 SY4S-51F1.