Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 71231S found under Spring Helical Compression by Robertson Fuel Systemsllc. The National Stock Number assigned to this part is 5360015783954, 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 71231S.