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		                        | National Stock Number:
 4810-01-049-2384
 
 Federal Supply Class:
 4810
 
 National Item Identification Number:
 010492384
 
 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:
 
 | 21900 | 16780 | EATON AEROSPACE LLC | 
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 Techincal Specification:
 
 | STYLE DESIGNATOR | PLAIN FLANGED |  | FLANGE DIAMETER | 0.373 INCHES MINIMUM AND |  |  | 0.374 INCHES MAXIMUM |  | BODY OUTSIDE DIAMETER | 0.260 INCHES MINIMUM AND |  |  | 0.262 INCHES MAXIMUM |  | BODY INSIDE DIAMETER | 0.156 INCHES MINIMUM AND |  |  | 0.157 INCHES MAXIMUM |  | FLANGE SEAT TO DISK END HEIGHT | 0.069 INCHES MINIMUM AND |  |  | 0.070 INCHES MAXIMUM |  | UNDER FLANGE HEIGHT | 0.085 INCHES NOMINAL |  | MATERIAL | STEEL COMP 410 OVERALL |  | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |  | SURFACE TREATMENT | PASSIVATE OVERALL |  | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-171 MIL STD SINGLE TREATMENT RESPONSE OVERALL |  | HARDNESS RATING | 31.0 ROCKWELL C MINIMUM AND |  |  | 38.0 ROCKWELL C MAXIMUM OVERALL |  | SEATING SURFACE SHAPE | FLAT |  | FSC APPLICATION DATA | VALVE,RESET,POWERED |  | THE MANUFACTURERS DATA |  |  | MANUFACTURERS CODE | 16780 |  | DESIGN CONTROL REFERENCE | 21900 | 
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