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National Stock Number:
5306-01-209-7197
Federal Supply Class:
5306
National Item Identification Number:
012097197
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:
| MS9725-59 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD QUANTITY PER INCH | 24 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.543 INCHES MINIMUM AND | | 0.656 INCHES MAXIMUM | | FASTENER LENGTH | 4.241 INCHES MINIMUM AND | | 4.261 INCHES MAXIMUM | | MATERIAL | NICKEL ALLOY OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5708 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | HEAD STYLE | DOUBLE HEXAGON W/HOLE | | HEAD HEIGHT | 0.328 INCHES MINIMUM AND | | 0.348 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.375 INCHES NOMINAL | | EXTENDED WASHER DIAMETER | 0.490 INCHES MINIMUM AND | | 0.510 INCHES MAXIMUM | | EXTENDED WASHER THICKNESS | 0.070 INCHES MINIMUM | | GRIP LENGTH | 3.605 INCHES MINIMUM AND | | 3.698 INCHES MAXIMUM | | GRIP DIAMETER | 0.3110 INCHES MINIMUM AND | | 0.3120 INCHES MAXIMUM | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | 32.0 MICROINCHES GRIP | | 32.0 MICROINCHES THREADS | | SPEC/STD CONTROLLING DATA | | | MANUFACTURERS CODE | 96906 | | DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS9725-59 |
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