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National Stock Number:
5306-01-037-8903
Federal Supply Class:
5306
National Item Identification Number:
010378903
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:
| MB145-6D31 | 73197 | HI-SHEAR CORPORATION | | MB145-6D31 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC | | ST3M729-6D31 | 06710 | VALLEY-TODECO, INC. | | ST3M729-6D31 | 06725 | SPS TECHNOLOGIES, LLC | | ST3M729-6D31 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M729-6D31 | 0ZC92 | HEARTLAND PRECISION FASTENERS INC | | ST3M729-6D31 | 17446 | HUCK INTERNATIONAL, INC | | ST3M729-6D31 | 56878 | SPS TECHNOLOGIES, LLC | | ST3M729-6D31 | 58998 | FASTENER INNOVATION TECHNOLOGY, INC. | | ST3M729-6D31 | 73197 | HI-SHEAR CORPORATION | | ST3M729-6D31 | 76301 | THE BOEING COMPANY | | ST3M729-6D31 | 80539 | SPS TECHNOLOGIES, LLC | | ST3M729-6D31 | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC | | ST3M729-6D31 | 97928 | HUCK INTL INC | | ST3M729-6D31 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 2.185 INCHES MINIMUM AND 2.252 INCHES MAXIMUM FIRST HOLE | | FASTENER LENGTH | 2.313 INCHES MINIMUM AND 2.360 INCHES MAXIMUM | | GRIP DIAMETER | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM | | GRIP LENGTH | 1.928 INCHES MINIMUM AND 1.948 INCHES MAXIMUM | | HEAD HEIGHT | 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM | | HEAD STYLE | DOUBLE HEXAGON | | MATERIAL DOCUMENT AND CLASSIFICATION | 23-112,MCDONNEL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.375 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE | | WIDTH BETWEEN FLATS | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.365 INCHES MINIMUM AND 0.432 INCHES MAXIMUM | | THREAD QUANTITY PER INCH | 24 | | THREAD SERIES DESIGNATOR | UNJF |
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