4820-01-431-9912 VALVE,CHECK Index 5310-01-431-9914 WASHER,RECESSED

National Stock Number:
5305-01-431-9913

Federal Supply Class:
5305

National Item Identification Number:
014319913

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:
21104851853711NAVAL SEA SYSTEMS COMMAND
752-6406821-4353711NAVAL SEA SYSTEMS COMMAND
752-6406841-3553711NAVAL SEA SYSTEMS COMMAND


Techincal Specification:
THREAD SERIES DESIGNATORUNRC
NOMINAL THREAD DIAMETER0.312 INCHES
THREAD QUANTITY PER INCH18
THREAD CLASS3A
FASTENER LENGTH1.500 INCHES NOMINAL
MATERIALSTEEL OVERALL
PLASTIC POLYAMIDE LOCKING FEATURE
HEAD STYLEFLAT FILLISTER
HEAD DIAMETER0.457 INCHES MINIMUM AND
0.469 INCHES MAXIMUM
HEAD HEIGHT0.306 INCHES MINIMUM AND
0.312 INCHES MAXIMUM
INTERNAL DRIVE STYLEHEXAGON
WIDTH ACROSS FLATS0.250 INCHES NOMINAL
LOCKING FEATUREPATCH OR
PELLET OR
STRIP THREADS


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