Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RI 50311J 1 found under Spring Special by Matthew Warren Inc. The National Stock Number assigned to this part is 5360013074130, 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 RI 50311J 1.