M18x1.5 NYLOC NUT ZP

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

GST Incl
Excl
M18x1.5 NYLOC NUT ZP
NNYL18Z15
Each
$3.9369