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National Stock Number:
5306-01-448-0668
Federal Supply Class:
5306
National Item Identification Number:
014480668
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:
| BACB30FA4-8 | 06950 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30FA4-8 | 1RC86 | HOWMET GLOBAL FASTENING SYSTEMS INC | | BACB30FA4-8 | 56878 | SPS TECHNOLOGIES, LLC | | BACB30FA4-8 | 73197 | HI-SHEAR CORPORATION | | BACB30FA4-8 | 81205 | THE BOEING COMPANY | | BACB30FA4-8 | 9N513 | VOI-SHAN/CHATSWORTH DIV OF VSI CORP SUB OF FAIRCHILD INDUSTRIES INC | | BACB30FA4-8 | L4528 | LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.469 INCHES NOMINAL | | FASTENER LENGTH | 0.953 INCHES MINIMUM AND | | 1.000 INCHES MAXIMUM | | MATERIAL | PLASTIC POLYAMIDE LOCKING FEATURE | | STEEL COMP 4130 FASTENER | | SURFACE TREATMENT | CADMIUM OVERALL | | MINIMUM TENSILE STRENGTH | 160000 POUNDS PER SQUARE INCH | | HEAD STYLE | FLAT COUNTERSUNK UNDERCUT | | HEAD DIAMETER | 0.464 INCHES MINIMUM AND | | 0.510 INCHES MAXIMUM | | HEAD HEIGHT | 0.112 INCHES NOMINAL | | COUNTERSINK ANGLE | 99.0 DEGREES MINIMUM AND | | 101.0 DEGREES MAXIMUM | | LOCKING FEATURE | STRIP OR | | PATCH OR | | PELLET LOCKING FEATURE | | GRIP LENGTH | 0.490 INCHES MINIMUM AND | | 0.510 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM |
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