Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 457B20 found under Bearing Trunion Link by Sargent Technologies Inc. The National Stock Number assigned to this part is 3110007768271, 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 457B20.