he heat treatment fixture is a work holding device used to secure the workpiece during heat treatment. Those fixtures fail prematurely due to high thermal and fatigue loads. Thus, alternative fixture design is required in order to improve the life of the fixture. In this paper, the alternative designs that are analysed are inspired from 3D infill patterns. The infill patterns considered and evaluated for the fixture design are honeycomb structure, diamond structure and concentric circular structure. The patterns are modelled with the help of solid works with constant mass and diameter. It is further analysed with coupled thermal structural analysis, factor of safety and fatigue life with the help of ANSYS workbench 18.0 and the best-suited design for the fixture is evaluated.