Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20C249 found under Clip Spring Tension by Lewis Spring And Mfg Company. The National Stock Number assigned to this part is 5340013010133, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20C249.