Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SSR1929-04 found under Washer Spring Tensi by Smalley Steel Ring Co. The National Stock Number assigned to this part is 5310012718402, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SSR1929-04.