Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JRB 1940 found under Ring Retaining by Rolls Royce Marine North America. The National Stock Number assigned to this part is 5325005433388, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like JRB 1940.