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		                        | National Stock Number:
 4820-00-288-5407
 
 Federal Supply Class:
 4820
 
 National Item Identification Number:
 002885407
 
 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:
 
 | 1617215-1 | 99251 | MISSION SYSTEMS DAVENPORT INC. | 
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 Techincal Specification:
 
 | STYLE DESIGNATOR | PLAIN FLANGED |  | FLANGE DIAMETER | 0.307 INCHES MINIMUM AND |  |  | 0.309 INCHES MAXIMUM |  | BODY OUTSIDE DIAMETER | 0.153 INCHES MINIMUM AND |  |  | 0.155 INCHES MAXIMUM |  | BODY INSIDE DIAMETER | 0.109 INCHES MINIMUM AND |  |  | 0.111 INCHES MAXIMUM |  | FLANGE SEAT TO DISK END HEIGHT | 0.108 INCHES MINIMUM AND |  |  | 0.110 INCHES MAXIMUM |  | UNDER FLANGE HEIGHT | 0.090 INCHES MINIMUM AND |  |  | 0.098 INCHES MAXIMUM |  | MATERIAL | STEEL COMP 440C OVERALL |  | HARDNESS RATING | 55.0 ROCKWELL C NOMINAL OVERALL |  | SEATING SURFACE SHAPE | RADIAL |  | FSC APPLICATION DATA | ACFT AIR CONDITIONING,OXYGEN SYSTEM |  | THE MANUFACTURERS DATA |  |  | MANUFACTURERS CODE | 99251 |  | DESIGN CONTROL REFERENCE | 1617215-1 | 
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