Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E0500-055-5000S found under Spring Helical Extension by Associated Spring Corp. The National Stock Number assigned to this part is 5360001389951, 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 E0500-055-5000S.