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National Stock Number:
5306-01-159-5731
Federal Supply Class:
5306
National Item Identification Number:
011595731
Description:
BOLT,CLOSE TOLERANCE
Detail:
An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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 not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see BOLT, SHEAR. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see BOLT, MACHINE.
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Manufacturer Information:
| BACB30LJ4021 | 17446 | HUCK INTERNATIONAL, INC | | BACB30LJ4021 | 81205 | THE BOEING COMPANY | | BACB30LJ4021 | 97928 | HUCK INTL INC | | BACB30LJ4D21 | 06710 | VALLEY-TODECO, INC. | | BACB30LJ4D21 | 06725 | SPS TECHNOLOGIES, LLC | | BACB30LJ4D21 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LJ4D21 | 17446 | HUCK INTERNATIONAL, INC | | BACB30LJ4D21 | 17943 | FEDERAL MANUFACTURING CORP | | BACB30LJ4D21 | 27624 | SPS TECHNOLOGIES LLC | | BACB30LJ4D21 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30LJ4D21 | 81205 | THE BOEING COMPANY | | BACB30LJ4D21 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30LJ4D21 | 97928 | HUCK INTL INC |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.560 INCHES MINIMUM AND 1.610 INCHES MAXIMUM FIRST HOLE | | FASTENER LENGTH | 1.686 INCHES MINIMUM AND 1.716 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM | | HEAD HEIGHT | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM | | HEAD STYLE | UNDERCUT HEXAGON | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | IRON ALLOY 660 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES NOMINAL FIRST HOLE | | SPECIFICATION/STANDARD DATA | 81205-BACB30LJ MANUFACTURERS STANDARD | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE FINISH | 32.0 MICROINCHES THREADS | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2,CL 2 FED SPEC 1ST TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM AND CHROMATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.364 INCHES MINIMUM AND 0.414 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 28 | | THREAD SERIES DESIGNATOR | UNF |
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