Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 420372 ITEM 22 found under Spring Helical Comp by Smalley Steel Ring Co. The National Stock Number assigned to this part is 5360014218337, 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 420372 ITEM 22.