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National Stock Number:
5306-01-108-6827
Federal Supply Class:
5306
National Item Identification Number:
011086827
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:
| 3M33-4D12 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNF | | 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 | 1.203 INCHES MINIMUM AND | | 1.250 INCHES MAXIMUM | | MATERIAL | IRON ALLOY 660 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | HEAD STYLE | HEXAGON | | HEAD HEIGHT | 0.140 INCHES MINIMUM AND | | 0.172 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.428 INCHES MINIMUM AND | | 0.440 INCHES MAXIMUM | | GRIP LENGTH | 0.740 INCHES MINIMUM AND | | 0.760 INCHES MAXIMUM | | GRIP DIAMETER | 0.2487 INCHES MINIMUM AND | | 0.2492 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.046 INCHES MINIMUM AND | | 1.078 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.074 INCHES MINIMUM AND | | 0.079 INCHES MAXIMUM FIRST HOLE | | THE MANUFACTURERS DATA | | | MANUFACTURERS CODE | 76301 | | DESIGN CONTROL REFERENCE | 3M33-4D12 |
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