This is a M18 Hex Nut. Nut length is 31mm. Accurate design. 4 file formats are attached. 3d editable iges file format attached. Details: Thread Pitch: 2.5mm Height: 15mm Width: 27mm Thread Dia: M18 (18mm)
Custom size and design possible, you have to contact with me. If you want other file formats please contact with me.
Thanks, Mahbub