5305-01-374-5944 SCREW,CLOSE TOLERANCE Index 5305-01-374-5946 SCREW,CLOSE TOLERANCE

National Stock Number:
5305-01-374-5945

Federal Supply Class:
5305

National Item Identification Number:
013745945

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:
110179-4-8ASM80539SPS TECHNOLOGIES, LLC
110179-4-8ASMK5673SPS TECHNOLOGIES LTD TJ BROOKS DIVISION
BM33024V4-8UM17446HUCK INTERNATIONAL, INC
HT8137-4-8ASM5M902HOWMET GLOBAL FASTENING SYSTEMS INC.
HT271A4-8M73197HI-SHEAR CORPORATION
HT271A4-8ML4528LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC
ST3M40V4-8ASM17446HUCK INTERNATIONAL, INC
ST3M430V4-8ASM17446HUCK INTERNATIONAL, INC
ST3M430V4-8ASM58998FASTENER INNOVATION TECHNOLOGY, INC.
ST3M40V4-8ASM73197HI-SHEAR CORPORATION
ST3M40V4-8ASM80539SPS TECHNOLOGIES, LLC
ST3M40V4-8ASM92215HOWMET GLOBAL FASTENING SYSTEMS INC
HT8137-4-8ASM92215HOWMET GLOBAL FASTENING SYSTEMS INC
ST3M40V4-8ASMK5673SPS TECHNOLOGIES LTD TJ BROOKS DIVISION
ST3M430V4-8ASM76301THE BOEING COMPANY


Techincal Specification:
COUNTERSINK ANGLE100.0 DEGREES NOMINAL
FASTENER LENGTH0.963 INCHES MINIMUM AND 0.990 INCHES MAXIMUM
FEATURES PROVIDEDDRY FILM LUBRICANT AND O RING
GRIP DIAMETER0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM
HEAD HEIGHT0.1060 INCHES MINIMUM AND 0.1080 INCHES MAXIMUM
HEAD DIAMETER0.5018 INCHES MINIMUM AND 0.5066 INCHES MAXIMUM
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
INTERNAL DRIVE STYLEHIGH-TORQUE
MATERIALTITANIUM ALLOY UNS R56400 OR TITANIUM ALLOY UNS R56440 OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD32.0 MICROINCHES THREADS
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3A
THREAD LENGTH0.469 INCHES NOMINAL
THREAD SERIES DESIGNATORUNJF
THREAD QUANTITY PER INCH28


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