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National Stock Number:
5305-01-045-2904
Federal Supply Class:
5305
National Item Identification Number:
010452904
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:
| BACB30LU5-24 | 06710 | VALLEY-TODECO, INC. | | BACB30LU5-24 | 06725 | SPS TECHNOLOGIES, LLC | | BACB30LU5-24 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LU5-24 | 17446 | HUCK INTERNATIONAL, INC | | BACB30LU5-24 | 17943 | FEDERAL MANUFACTURING CORP | | BACB30LU5-24 | 27624 | SPS TECHNOLOGIES LLC | | BACB30LU5-24 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30LU5-24 | 57928 | SONIC INDUSTRIES, INC. | | BACB30LU5-24 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30LU5-24 | 81205 | THE BOEING COMPANY | | BACB30LU5-24 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LU5-24 | 97928 | HUCK INTL INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD QUANTITY PER INCH | 24 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.444 INCHES MINIMUM AND | | 0.494 INCHES MAXIMUM | | FASTENER LENGTH | 1.954 INCHES MINIMUM AND | | 1.984 INCHES MAXIMUM | | MATERIAL | STEEL COMP 8740 OR | | STEEL COMP E4340 OVERALL | | SURFACE TREATMENT | CADMIUM AND | | CHROMATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | HEAD STYLE | FLAT COUNTERSUNK | | HEAD DIAMETER | 0.574 INCHES MINIMUM AND | | 0.637 INCHES MAXIMUM | | COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 | | GRIP LENGTH | 1.490 INCHES MINIMUM AND | | 1.510 INCHES MAXIMUM | | GRIP DIAMETER | 0.3110 INCHES MINIMUM AND | | 0.3120 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS |
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