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National Stock Number:
5306-01-101-6031
Federal Supply Class:
5306
National Item Identification Number:
011016031
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:
| J812P004A | 07482 | GENERAL ELECTRIC COMPANY | | J812P004A | 78286 | SIKORSKY AIRCRAFT CORPORATION |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.164 INCHES | | THREAD QUANTITY PER INCH | 36 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.519 INCHES MINIMUM AND | | 0.549 INCHES MAXIMUM | | FASTENER LENGTH | 0.680 INCHES MINIMUM AND | | 0.700 INCHES MAXIMUM | | MATERIAL | NICKEL ALLOY 718 OVERALL | | HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER | | HEAD HEIGHT | 0.211 INCHES MINIMUM AND | | 0.231 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.219 INCHES NOMINAL | | EXTENDED WASHER DIAMETER | 0.302 INCHES MINIMUM AND | | 0.322 INCHES MAXIMUM | | EXTENDED WASHER THICKNESS | 0.030 INCHES MINIMUM AND | | 0.040 INCHES MAXIMUM | | GRIP LENGTH | 0.151 INCHES MINIMUM AND | | 0.161 INCHES MAXIMUM | | GRIP DIAMETER | 0.1630 INCHES MINIMUM AND | | 0.1635 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS |
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