The Nyloc nut is an economic locking nut and ideal in applications where vibration or motion could loosen or undo the nut.
It uses a nylon insert located towards the top of the nut, reducing its inner diameter, which then deforms over the mating thread.
Metric Fine Thread
Thread Pitch = 1.5mm
Hexagon Across the Flats ( AF ) = 27mm
DIN Standard 985
Yellow Zincplated Finish