A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5835-00-498-8189
NSN 5855-01-316-4975
NSN 5925-00-485-2851
NSN 6645-00-689-8144
NSN 5925-01-398-3244
NSN 5950-01-053-1073
NSN 5965-01-578-6911
NSN 5930-01-338-5052
NSN 6105-00-043-0550
NSN 6320-01-141-3791
NSN 6240-01-370-4789
NSN 6645-01-571-1234