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National Stock Number:
5306-01-528-6952
Federal Supply Class:
5306
National Item Identification Number:
015286952
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:
| BACB30LJ5-19 | 81205 | THE BOEING COMPANY | | BACB30LJ5-19 | Z03F0 | BOEING DEFENCE AUSTRALIA LTD | | BACB30LJ5-19 | Z8T75 | BOEING DEFENCE AUSTRALIA LTD | | BACB30NF5-19 | 81205 | THE BOEING COMPANY |
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Techincal Specification:
| FASTENER LENGTH | 1.569 INCHES MINIMUM AND 1.589 INCHES MAXIMUM | | GRIP DIAMETER | 0.311 INCHES NOMINAL | | GRIP LENGTH | 0.950 INCHES NOMINAL | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL | | HEAD HEIGHT | 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM | | HEAD STYLE | DISHED HEXAGON | | HOLE DIAMETER | 0.3110 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM | | MATERIAL | STEEL COMP E4340 OVERALL | | MINIMUM TENSILE STRENGTH | 16000 POUNDS PER SQUARE INCH | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | WIDTH BETWEEN FLATS | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE TREATMENT | CHROMATE AND CADMIUM OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 24 |
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