NSN 4820-01-181-8657

Part Details | VALVE SEAT

4820-01-181-8657 A replaceable item designed to provide a 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.

Alternate Parts: 6553255 PIECE 9, 6553-255 PIECE 9, 6553255, 6553-255, 2084325303 PIECE 9, 208-4325303 PIECE 9, 2084325303, 208-4325303, 2084325303 PIE, 208-4325303 PIE, 4820-01-181-8657, 01-181-8657, 4820011818657, 011818657

Supply Group (FSG) NSN Assigned NIIN Item Name Code (INC)
48JUN 16, 198401-181-865722113 ( SEAT, VALVE )
REFERENCE DRAWINGS & PICTURES

PLAIN THREADED

Cross Reference | NSN 4820-01-181-8657
Part Number Cage Code Manufacturer
6553-255 PIECE 943689HUNTINGTON INGALLS INCORPORATEDDIV NEWPORT NEWS
6553-25543689HUNTINGTON INGALLS INCORPORATEDDIV NEWPORT NEWS
208-4325303 PIECE 980064NAVAL SHIP SYSTEMS COMMAND
208-432530380064NAVAL SHIP SYSTEMS COMMAND
208-4325303 PIE80004PRECISION RADIATION INSTRUMENTS INC
Technical Data | NSN 4820-01-181-8657
Characteristic Specifications
STYLE DESIGNATOR PLAIN THREADED
OVERALL HEIGHT0.634 INCHES NOMINAL
BODY INSIDE DIAMETER4.250 INCHES NOMINAL
SEATING SURFACE SHAPE FLAT
SPECIAL FEATURESW/2 STD WRENCH NOTCHES ON THE ID