Heat transfer into storage vessel and loss of cryogen is a major concern of a cryogenic system designer. Propellant storage tanks of cryogenic launch vehicle stages are to be provided with optimum insulation, considering the heat-in-leak and mass constraints. Though main focus is given to the insulation of tank shell and domes, the heat transfer through the mountings attached to the tank also plays a major role. The mountings are used for supporting structures and flow components. Some of such mountings require ambient temperature at its end to meet functional requirement. The full insulation of the mounting and attached member ensures minimum heat-in-leak. At the same time removal of insulation increases temperature at end of the mounting and lower mass of the system. In the present study, the influence of the extent of insulation on the attached member is experimentally evaluated. The removal of insulation on extended member increases heat transfer only by 23% for the case studied. The removal of two-third or full insulation increases the interface temperature to near ambient. A numerical model is created for the prediction of temperature and is validated by the experiments.