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		                        | National Stock Number:
 4820-01-063-1895
 
 Federal Supply Class:
 4820
 
 National Item Identification Number:
 010631895
 
 Description:
 SEAT,VALVE
 
 Detail:
 A replaceable item designed to provide a circular stationary seating surface for a mating, moveable item such as a valve disk or the like. The body may have a flange of various shapes. For diesel and gasoline reciprocating engines, see INSERT, ENGINE VALVE SEAT.
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 Manufacturer Information:
 
 | 2640-820X8PC3 | 96169 | ELECTRIC BOAT CORPORATION |  | 803-2178493 PIECE 30 | 80064 | NAVAL SHIP SYSTEMS COMMAND |  | 810-2178493 | 53711 | NAVAL SEA SYSTEMS COMMAND |  | 810-2178493PIECE3 | 53711 | NAVAL SEA SYSTEMS COMMAND |  | 803-2178493-A-3 | 80064 | NAVAL SHIP SYSTEMS COMMAND | 
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 Techincal Specification:
 
 | STYLE DESIGNATOR | PLAIN |  | OVERALL HEIGHT | 0.358 INCHES NOMINAL |  | BODY OUTSIDE DIAMETER | 3.873 INCHES NOMINAL |  | BODY INSIDE DIAMETER | 3.430 INCHES NOMINAL |  | MATERIAL | NICKEL ALLOY OVERALL |  | SEATING SURFACE SHAPE | FLAT |  | SPECIAL FEATURES | ID.COUNTERBORED TO 3.500 IN.DIA.AND 0.312 IN.DEPTH | 
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