5305-00-491-1378 SCREW,SHOULDER Index 5340-00-491-1380 POST,ELECTRICAL-MECHANICAL EQUIPMENT

National Stock Number:
5305-00-491-1379

Federal Supply Class:
5305

National Item Identification Number:
004911379

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:
4828108-188277THE BOEING COMPANY


Techincal Specification:
COUNTERSINK ANGLE99.5 DEGREES MINIMUM AND 100.5 DEGREES MAXIMUM
FASTENER LENGTH0.578 INCHES MINIMUM AND 0.608 INCHES MAXIMUM
HEAD DIAMETER0.538 INCHES MINIMUM AND 0.548 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK
NOMINAL THREAD DIAMETER0.312 INCHES
INTERNAL DRIVE STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATION1893 FSCM 88277 MFR REF SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL CORROSION RESISTING OVERALL
MINIMUM TENSILE STRENGTH220000 POUNDS PER SQUARE INCH
WIDTH ACROSS FLATS0.156 INCHES MINIMUM AND 0.158 INCHES MAXIMUM
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION251 FSCM 88277 MFR REF SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.311 INCHES MINIMUM AND 0.437 INCHES MAXIMUM
THREAD QUANTITY PER INCH24
THREAD SERIES DESIGNATORUNF


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