Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K4255J found under Bearing Ball Annula by Energy Services Group. The National Stock Number assigned to this part is 3110006583644, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K4255J.