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: 2.5mmHeight: 15mmWidth: 27mmThread 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