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National Stock Number:
5306-01-454-7320
Federal Supply Class:
5306
National Item Identification Number:
014547320
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:
| 3000T93P08 | 99207 | GENERAL ELECTRIC COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.190 INCHES | | THREAD QUANTITY PER INCH | 32 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | FASTENER LENGTH | 0.740 INCHES MINIMUM AND | | 0.760 INCHES MAXIMUM | | MATERIAL | IRON ALLOY 660 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | HARDNESS RATING | 29.0 ROCKWELL C MINIMUM AND | | 42.0 ROCKWELL C MAXIMUM OVERALL | | HEAD STYLE | DOUBLE HEXAGON W/HOLE | | HEAD HEIGHT | 0.250 INCHES MINIMUM AND | | 0.270 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.243 INCHES MINIMUM AND | | 0.251 INCHES MAXIMUM | | EXTENDED WASHER DIAMETER | 0.365 INCHES MINIMUM AND | | 0.385 INCHES MAXIMUM | | EXTENDED WASHER THICKNESS | 0.040 INCHES MINIMUM AND | | 0.050 INCHES MAXIMUM | | GRIP LENGTH | 0.250 INCHES MINIMUM AND | | 0.260 INCHES MAXIMUM | | GRIP DIAMETER | 0.2189 INCHES MINIMUM AND | | 0.2194 INCHES MAXIMUM | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | 32.0 MICROINCHES THREADS |
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