bolt 3d model

Generate two separate 3D objects, both clean and mechanical, with precise geometric shapes suitable for 3D printing. Object 1 : A bolt (screw) – Cylindrical shaft with a functional ISO-style helical thread – Diameter of the threaded shaft: 20 mm – Thread pitch: 3 mm – Length of the threaded shaft: 40 mm – Add a solid hexagonal head on top – Hex head width across flats: 32 mm – Head height: 12 mm – The bolt must be a single solid object Object 2 : A matching nut – Hexagonal outer shape – Width across flats: 32 mm – Height: 12 mm – Internal cylindrical hole with matching ISO-style helical thread – Internal thread diameter: 20 mm – Thread pitch: 3 mm – The nut must be a single solid object Both objects must be clean, symmetrical, watertight, and ready for 3D printing. No artistic deformation, no smoothing, no organic shapes. Strictly mechanical, sharp edges, precise geometry. Output the two objects separately.