Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31CJ found under Compressing Tool Splicing Sleeve by National Telephone Supply Company. The National Stock Number assigned to this part is 5120005969311, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 31CJ.