This is a M14 Locking Acorn Nuts. Nut length is 25.30mm. Accurate design. 4 file formats are attached. Details: Thread Pitch: 2 mm Height: 25.30 mm Width: 22 mm Thread Dia: M14 (14mm)
Custom size and design possible, you have to contact with me. If you want other file formats please contact with me.
Thanks, Mahbub