Check out M12 Castle Nut 3D model on CGTrader for $2. High-quality Polygon mesh mesh by VSJP1000: 7200 polys, 3700 vertices.
STL (Stereolithography, filesize: 382 KB), OBJ (OBJ, filesize: 614 KB), 3MF (3D Manufacturing File, filesize: 99.6 KB), STP (STEP, filesize: 1.09 MB), IGE (IGES, filesize: 1.22 MB), OTHER (Other, filesize: 1.1 MB), DAE (Collada, filesize: 4.12 MB)