0.550 inches minimum and 0.560 inches maximum outside diameter, 0.270 inches minimum and 0.280 inches maximum aperture diameter, one-piece construction, steel comp 301 or steel comp 302 or steel comp 303 or steel comp 316 or steel comp 321 material, mil-s-5059 mil spec 1st material response or mil-s-5059 mil spec 2nd material response or mil-s-7720 mil spec 3rd material response or mil-s-5059 mil spec 4th material response or ams 5510 assn std 5th material response material document and classification, circular style designator

A thin flat metal or plastic item of various peripheral shapes having a solid or laminated cross-section. It is designed to maintain a predetermined distance between two surfaces. For round items without a hole and having a solid rectangular cross-section use disk, solid, plain. Items with either (1) a solid (not laminated) cross-section, or (2) a non-separable laminated cross-section with one hole centrally located, must have a thickness less than 0.006 inch (0.152 mm) for items less than 1/4 inch (6.35 mm) outside diameter or shortest distance across peripheral flats, and less than 0.016 inch (0.406 mm) for items 1/4 inch (6.35 mm) or more outside diameter, or shortest distance across peripheral flats. For items with thickness greater than those indicated above, see spacer, plate; washer, flat and spacer, ring. When thickness and/or outside diameter or shortest distance across peripheral flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance. See also shim stock, laminated; shim stock assortment, gasket; and bearing, washer, thrust.