5305-01-197-8272 SCREW,CLOSE TOLERANCE Index 5305-01-197-8274 SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-197-8273

Federal Supply Class:
5305

National Item Identification Number:
011978273

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:
10113526A486GNIMIKKEISTOKESKUS NCB FINLAND
HT4053-4-3A06950HOWMET GLOBAL FASTENING SYSTEMS INC
HT4053-4-3A0PTK6SPS TECHNOLOGIES INC
HT4053-4-3A17446HUCK INTERNATIONAL, INC
HT4053-4-3A58998FASTENER INNOVATION TECHNOLOGY, INC.
HT4053-4-3A5M902HOWMET GLOBAL FASTENING SYSTEMS INC.
ST3M740-4L3007R1TWIST TITE MFG, INC
HT4053-4-3A60516WEST COAST AEROSPACE, INC.
HT4053-4-3A73197HI-SHEAR CORPORATION
HT4053-4-3A80539SPS TECHNOLOGIES, LLC
HT4053-4-3A92215HOWMET GLOBAL FASTENING SYSTEMS INC
HT4053-4-3A97928HUCK INTL INC
HT4053-4-3AK5673SPS TECHNOLOGIES LTD TJ BROOKS DIVISION
HT4053-4-3AL4528LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC
ST3M740-4L376301THE BOEING COMPANY


Techincal Specification:
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER0.516 INCHES MINIMUM AND 0.556 INCHES MAXIMUM FIRST HOLE
FASTENER LENGTH0.642 INCHES MINIMUM AND 0.672 INCHES MAXIMUM
GRIP LENGTH0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
HARDNESS RATING39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
HEAD DIAMETER0.3898 INCHES MINIMUM AND 0.3948 INCHES MAXIMUM
HEAD STYLEOVAL COUNTERSUNK
INTERNAL DRIVE STYLEHIGH-TORQUE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 8740 OVERALL
MINIMUM TENSILE STRENGTH180000 POUNDS PER SQUARE INCH
NOMINAL THREAD DIAMETER0.250 INCHES
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-83488 TY 2 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTALUMINUM OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF)
THREAD QUANTITY PER INCH28


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