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National Stock Number:
5305-01-049-4057
Federal Supply Class:
5305
National Item Identification Number:
010494057
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:
| BACB30LH4-18 | 06710 | VALLEY-TODECO, INC. | | BACB30LH4-18 | 06725 | SPS TECHNOLOGIES, LLC | | BACB30LH4-18 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LH4-18 | 17446 | HUCK INTERNATIONAL, INC | | BACB30LH4-18 | 17943 | FEDERAL MANUFACTURING CORP | | BACB30LH4-18 | 1RC86 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LH4-18 | 27624 | SPS TECHNOLOGIES LLC | | BACB30LH4-18 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30LH4-18 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30LH4-18 | 81205 | THE BOEING COMPANY | | BACB30LH4-18 | 97928 | HUCK INTL INC | | BACB30LH4-18 | 9N513 | VOI-SHAN/CHATSWORTH DIV OF VSI CORP SUB OF FAIRCHILD INDUSTRIES INC |
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Techincal Specification:
| COUNTERSINK ANGLE | 100.0 DEGREES NOMINAL | | FASTENER LENGTH | 1.499 INCHES MINIMUM AND 1.529 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM | | HEAD DIAMETER | 0.455 INCHES MINIMUM AND 0.510 INCHES MAXIMUM | | HEAD STYLE | FLAT COUNTERSUNK | | INTERNAL DRIVE STYLE | CROSS RECESS TYPE 1 | | MATERIAL | IRON ALLOY 660 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIFICATION/STANDARD DATA | 81205-BACS12LH PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.364 INCHES MINIMUM AND 0.414 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 28 |
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