The following data describes the performance of the Liquid Metal eXperiment (LMX). doi: 10.1063/1.4973421 Data for the following is provided: 1) Pump output (liter/min vs. Pump RPM) 2) Height of the galinstan surface (mm vs. Pump RPM) 3) Measured surface velocity (cm/s vs. Pump RPM) 4) Comparison of velocity and velocity fits (cm/s vs. Pump RPM) Full-scale graphics are also provided.