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National Stock Number:
5305-01-240-1278
Federal Supply Class:
5305
National Item Identification Number:
012401278
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:
| 121557-3-A | 56878 | SPS TECHNOLOGIES, LLC | | 121557-3-A | 80539 | SPS TECHNOLOGIES, LLC | | AIC984-3-11 | 06725 | SPS TECHNOLOGIES, LLC | | C7984-3-11 | 06725 | SPS TECHNOLOGIES, LLC | | C7984-3-11 | 81755 | LOCKHEED MARTIN CORPORATION | | C7984 | 81755 | LOCKHEED MARTIN CORPORATION | | VT1693-3-11 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | H044-3-11 | 17446 | HUCK INTERNATIONAL, INC | | V044-3-11 | 17446 | HUCK INTERNATIONAL, INC | | PBF1165-3-11 | 27624 | SPS TECHNOLOGIES LLC | | VT1693-3-11 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | H044-3-11 | 97828 | SIMONETTA BROS | | V044-3-11 | 97928 | HUCK INTL INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNF | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | THREAD QUANTITY PER INCH | 32 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.298 INCHES MINIMUM AND | | 0.348 INCHES MAXIMUM | | FASTENER LENGTH | 0.996 INCHES MINIMUM AND | | 1.026 INCHES MAXIMUM | | MATERIAL | STEEL COMP H11 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND | | 49.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 220000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.325 INCHES MINIMUM AND | | 0.385 INCHES MAXIMUM | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | INTERNAL DRIVE STYLE | OFFSET CRUCIFORM (TORQUE SET) | | GRIP LENGTH | 0.678 INCHES MINIMUM AND | | 0.698 INCHES MAXIMUM | | GRIP DIAMETER | 0.1885 INCHES MINIMUM AND | | 0.1895 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS |
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