Internal groove
A circular-shaped item designed to maintain predetermined distance between assembled parts and/or for distributing pressure or preventing endwise movement between member parts. It has a solid cross-section and two flat parallel bearing surfaces. The distance between the bearing surfaces perpendicular to the axis of the centrally located hole shall not exceed 25 percent of the outside diameter. The diameter of the centrally located hole must exceed 75 percent of the outside diameter. Excludes laminated items. For items manufactured from impregnated graphite or lubricated nonmetallic materials, excluding felt or plastics, see gasket. For items manufactured from lubricated plastics, see bearing, washer, thrust. For items manufactured from lubricated felt, see felt, mechanical, preformed. Excludes disk, valve; insulator washer; and shim. See also spacer, plate and spacer, sleeve.
Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 5930-00-836-1080
NSN 6130-01-516-8457
NSN 2925-01-308-2195
NSN 6650-00-184-1581
NSN 5998-01-561-3636
NSN 6135-01-226-4071
NSN 6645-00-435-5610
NSN 6135-01-041-3829
NSN 6620-00-766-3974
NSN 5950-00-520-6093
NSN 6610-00-490-9514
NSN 5895-00-982-6050