Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4004C6-6-28 found under Roller Bearing by Wencor Group Llc. The National Stock Number assigned to this part is 3110012534487, 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 4004C6-6-28.