5305-01-520-3838 SCREW,CLOSE TOLERANCE Index 5305-01-520-3840 SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-520-3839

Federal Supply Class:
5305

National Item Identification Number:
015203839

Description:
SCREW,CLOSE TOLERANCE

Detail:
A SCREW, MACHINE or SCREW, CAP, SOCKET HEAD whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 IN.) (0.025 mm) or less of a specific diameter for items (1.000 IN.) (25 mm) or less in diameter. Items over (1.000 IN.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 IN.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 IN.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the Screw Thread Standards, FED STD H28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.


Manufacturer Information:
HT-181-4-1173197HI-SHEAR CORPORATION
HT-181-4-11L4528LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC


Techincal Specification:
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
FASTENER LENGTH1.140 INCHES MINIMUM AND 1.187 INCHES MAXIMUM
GRIP LENGTH0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
HEAD DIAMETER0.464 INCHES MINIMUM AND 0.506 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK
NOMINAL THREAD DIAMETER0.2500 INCHES
INTERNAL DRIVE STYLEHIGH-TORQUE
MATERIAL DOCUMENT AND CLASSIFICATIONNAS98 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
MINIMUM TENSILE STRENGTH6400 POUNDS PER SQUARE INCH
POINT LENGTH0.060 INCHES NOMINAL
POINT STYLEFLAT
THREAD QUANTITY PER INCH28
THREAD SERIES DESIGNATORUNJF
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS672 FED STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3A
THREAD LENGTH0.469 INCHES NOMINAL


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