Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LS501 14 found under Washer Spring Tension by Lewis Spring And Mfg Company. The National Stock Number assigned to this part is 5310004865342, 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 LS501 14.