4820-01-521-9950 VALVE ASSEMBLY Index 2920-01-521-9952 LEAD,IGNITION,ENGINE

National Stock Number:
5305-01-521-9951

Federal Supply Class:
5305

National Item Identification Number:
015219951

Description:
SCREW,CAP,SOCKET HEAD

Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See BOLT, INTERNAL WRENCHING. Excludes SCREW, SHOULDER; and SCREW, MACHINE.


Manufacturer Information:
7226364-353711NAVAL SEA SYSTEMS COMMAND


Techincal Specification:
FASTENER LENGTH1.860 INCHES MINIMUM AND 1.890 INCHES MAXIMUM
HEAD DIAMETER0.262 INCHES MINIMUM AND 0.270 INCHES MAXIMUM
HEAD HEIGHT0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM
HEAD STYLEFLAT CHAMFER
INTERNAL DRIVE STYLEHEXAGON
LOCKING FEATUREPATCH OR PELLET OR STRIP THREADS
MATERIALSTEEL CORROSION RESISTING OVERALL
NOMINAL THREAD DIAMETER0.164 INCHES
SPECIAL FEATURESALTERED ITEM DRAWING
WIDTH ACROSS FLATS0.140 INCHES MINIMUM AND 0.142 INCHES MAXIMUM
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.875 INCHES NOMINAL
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNC


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