Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KC31121-011 found under Plateretainingbearing by Kaman Aerospace Corporation. The National Stock Number assigned to this part is 3110016859718, 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 KC31121-011.