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National Stock Number:
5305-01-374-5944
Federal Supply Class:
5305
National Item Identification Number:
013745944
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.
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Manufacturer Information:
| HT271A3-7M | 73197 | HI-SHEAR CORPORATION | | HT271A3-7M | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M430V3-7ASM | 17446 | HUCK INTERNATIONAL, INC | | ST3M430V3-7ASM | 76301 | THE BOEING COMPANY | | ST3M430V3-7ASM | 80539 | SPS TECHNOLOGIES, LLC | | ST3M430V3-7ASM | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M430V3-7ASM | K5673 | SPS TECHNOLOGIES LTD TJ BROOKS DIVISION |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 0.838 INCHES MINIMUM AND 0.865 INCHES MAXIMUM | | FEATURES PROVIDED | DRY FILM LUBRICANT AND O RING | | GRIP DIAMETER | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM | | GRIP LENGTH | 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM | | HEAD DIAMETER | 0.276 INCHES MINIMUM AND 0.286 INCHES MAXIMUM | | HEAD HEIGHT | 0.0785 INCHES MINIMUM AND 0.0805 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL | TITANIUM ALLOY UNS R56400 OR TITANIUM ALLOY UNS R56440 OVERALL | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD32.0 MICROINCHES THREADS | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.406 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 32 |
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