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National Stock Number:
5306-01-049-3003
Federal Supply Class:
5306
National Item Identification Number:
010493003
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:
| BACB30NF4D37 | 06710 | VALLEY-TODECO, INC. | | BACB30NF4D37 | 06725 | SPS TECHNOLOGIES, LLC | | BACB30NF4D37 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30NF4D37 | 17943 | FEDERAL MANUFACTURING CORP | | BACB30NF4D37 | 27624 | SPS TECHNOLOGIES LLC | | BACB30NF4D37 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30NF4D37 | 80539 | SPS TECHNOLOGIES, LLC | | BACB30NF4D37 | 81205 | THE BOEING COMPANY | | BACB30NF4D37 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC |
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Techincal Specification:
| FASTENER LENGTH | 2.686 INCHES MINIMUM AND 2.716 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM | | GRIP LENGTH | 2.302 INCHES MINIMUM AND 2.322 INCHES MAXIMUM | | HEAD HEIGHT | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM | | HEAD STYLE | UNDERCUT HEXAGON | | MINIMUM TENSILE STRENGTH | 140000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SPECIFICATION/STANDARD DATA | 81205-BACB30NF MANUFACTURERS STANDARD | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.364 INCHES MINIMUM AND 0.414 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL JOINT FINE (UNJF) | | THREAD QUANTITY PER INCH | 28 | | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
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