| A circular item with two parallel bearing surfaces without hole(s) or groove(s). It has an outside diameter greater than its length, and may be fabric reinforced. Do not use if a more specific item name applies. For items primarily designed to rupture at a predetermined pressure, see DISK, RUPTURABLE. For items made of felt, see FELT, MECHANICAL, PREFORMED. For metallic or plastic items with a laminated cross section, see SHIM. Excludes DIAPHRAGM, VALVE, FLAT; DIAPHRAGM, VALVE, SPECIAL SHAPED; DISK, VALVE, NONMETALLIC; FILTERING DISK FLUID; and INSULATOR, DISK. |
