Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C163-4-3L3370 found under Nut Assembly Self Locking Gang C by Sps Technologies Inc. The National Stock Number assigned to this part is 5310012889161, 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 C163-4-3L3370.