threaded bolt 3d model

Generate a detailed 3D CAD model of a fully threaded thumb screw. The design features a large cylindrical head with prominent vertical knurling around the outer circumference for grip, and a flat top surface. The shaft beneath the head is completely covered in continuous helical machine threads that extend all the way from the blunt, chamfered tip up to the junction with the underside of the head, with no smooth shank section. Render in a neutral matte grey material.