Thread Dia: M3 ; Thread Pitch:0.5mm. Outer Dia: 5.5mm/0.22" Thickness: 3.9mm/0.15". Made of 304 stainless steel, rust resistance and durable to use.. With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque.. Can be widely used in door, construction machinery, shipbuilding and etc..
