Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number YMD-5278 ITEM 252 found under Bearing Roller Self Aligning by Appleton Electric Ltd. The National Stock Number assigned to this part is 3110013209278, 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 YMD-5278 ITEM 252.