A washer or cone or disk shape with a centrally located hole, designed to accommodate a flat or oval head screw and provide additional bearing area on the material being fastened. It may or may not have a flush flange feature.
NSN 6240-01-300-3811
NSN 6220-00-827-7423
NSN 6610-01-524-0636
NSN 6220-01-584-9168
NSN 5998-01-446-3004
NSN 6110-00-244-1354
NSN 5910-01-227-4024
NSN 5835-00-987-9341
NSN 5915-00-141-0410
NSN 6645-00-975-2103
NSN 2925-01-110-1467
NSN