$12 Threading Tap 3D model by ecati. Available on CGTrader with 29019 polys and 19742 vertices. Check it out on CGHub.
SKP (Sketchup, filesize: 1.77 MB), OBJ (OBJ, filesize: 1.15 MB), FBX (Autodesk FBX, filesize: 1.94 MB), 3DS (3D Studio, filesize: 694 KB), DAE (Collada, filesize: 485 KB)