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National Stock Number:
5305-00-450-7449
Federal Supply Class:
5305
National Item Identification Number:
004507449
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:
| 3M123-4 | 18355 | THE BOEING COMPANY | | 3M123-4D3 | 76301 | THE BOEING COMPANY | | 54291-4D3 | 0PTK6 | SPS TECHNOLOGIES INC | | 54291-4D3 | 56878 | SPS TECHNOLOGIES, LLC | | 54291-4D3 | 80539 | SPS TECHNOLOGIES, LLC | | E1284D3P | 97928 | HUCK INTL INC | | HT1029A4T3 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT123-4-3D | 17446 | HUCK INTERNATIONAL, INC | | HT4M-3D | 73197 | HI-SHEAR CORPORATION | | HT4N-3D | 73197 | HI-SHEAR CORPORATION | | HT1029A4T3 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | HT123-4-3D | 97928 | HUCK INTL INC | | HT1029A4T3 | C4293 | ALCOA FASTENING SYSTEMS FAIRCHILDFASTENERS EUROPE - VSD GMBH | | HT4M-3D | C4293 | ALCOA FASTENING SYSTEMS FAIRCHILDFASTENERS EUROPE - VSD GMBH | | HT4N-3D | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 0.500 INCHES NOMINAL FIRST HOLE | | FASTENER LENGTH | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM | | GRIP DIAMETER | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM | | HARDNESS RATING | 248.0 BRINELL STANDARD MINIMUM AND 341.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM OVERALL | | HEAD DIAMETER | 0.502 INCHES MINIMUM AND 0.507 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | HIGH-TORQUE | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | IRON ALLOY 660 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.070 INCHES NOMINAL FIRST HOLE | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNF | | THREAD QUANTITY PER INCH | 28 |
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