5305-00-143-1865 SCREW,CLOSE TOLERANCE Index 5305-00-143-1869 SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-00-143-1866

Federal Supply Class:
5305

National Item Identification Number:
001431866

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:
106334-4-17D56878SPS TECHNOLOGIES, LLC
106334-4-17D80539SPS TECHNOLOGIES, LLC
202-15522-4A1780378TRIUMPH AEROSTRUCTURES, LLC


Techincal Specification:
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER1.230 INCHES MINIMUM AND 1.309 INCHES MAXIMUM FIRST HOLE
COUNTERSINK ANGLE99.5 DEGREES MINIMUM AND 101.5 DEGREES MAXIMUM
FASTENER LENGTH1.362 INCHES MINIMUM AND 1.409 INCHES MAXIMUM
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH1.052 INCHES MINIMUM AND 1.072 INCHES MAXIMUM
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER0.362 INCHES MINIMUM AND 0.395 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK
INTERNAL DRIVE STYLEOFFSET CRUCIFORM (TORQUE SET)
MATERIALSTEEL COMP H11 OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES NOMINAL FIRST HOLE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM
THREAD QUANTITY PER INCH28
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF)


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