Check out Bolt Nut Complex 3D model on CGTrader for $150. High-quality mesh by theovazinin.
STL (Stereolithography, filesize: 14.1 KB), OBJ (OBJ, filesize: 16.2 KB), 3DS (3D Studio, filesize: 20.9 KB), DAE (Collada, filesize: 44 KB), FBX (Autodesk FBX, filesize: 49.3 KB), IGE (IGES, filesize: 299 Bytes), MAX (Autodesk 3ds Max, filesize: 60.9 KB), SKP (Sketchup, filesize: 209 KB), OTHER (Other, filesize: 17.8 KB)