Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3TKCRDD21-28-187 found under Bearing Ball Airfra by Amsco Inc. The National Stock Number assigned to this part is 3110011328314, 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 3TKCRDD21-28-187.