Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 120281ZB1W500AD found under Ball Bearing by Winsted Precision Ball Corp. The National Stock Number assigned to this part is 3110013479940, 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 120281ZB1W500AD.