Check out Industrial robot arm dirty 3D model on CGTrader for $29. High-quality Subdivision ready mesh by otto-m: 139316 polys, 72746 vertices. Rigged, PBR, Textured.
BLEND (Blender, filesize: 12.7 MB), OBJ (OBJ, filesize: 1.63 MB), FBX (Autodesk FBX, filesize: 1.75 MB), TEXTURES (Textures, filesize: 405 MB)