Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MRTB20E57-089 found under Terminal Junction B by Amphenol Optimize Manufacturing Co. The National Stock Number assigned to this part is 5940010280468, and the Federal Supply Class is 5940 Lugs Terminals And Terminal Strips. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MRTB20E57-089.