Plastic mil-m-20693 or l-p-410
A nonmetallic unthreaded item generally round in cross-sectional shape which, when placed on/in a machined-out portion of the threads of a screw or bolt, or inserted into the machined-out portion of the threads of a nut, locks the item, to which it is fixed, to the attached mating member and prevents loosening during excessive vibration. Excludes bolt, self-locking; nut, self-locking (as modified); screw, self-locking; and insert, screw thread.
NSN 5985-01-215-1574
NSN 6110-00-141-1966
NSN 5930-01-099-8781
NSN 4140-01-563-0908
NSN 6610-01-326-0119
NSN 5855-01-283-3730
NSN 6610-01-633-6773
NSN 6240-00-304-7015
NSN 6105-01-610-2555
NSN 5999-01-274-7369
NSN 6650-00-698-5869
NSN 5996-01-383-9308