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National Stock Number:
5306-01-387-0521
Federal Supply Class:
5306
National Item Identification Number:
013870521
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:
| MS9218-05 | 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 | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.349 INCHES NOMINAL | | FASTENER LENGTH | 0.527 INCHES NOMINAL | | MATERIAL | STEEL COMP 601 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6304 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | NICKEL AND | | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 42.0 ROCKWELL C MINIMUM AND | | 46.0 ROCKWELL C MAXIMUM OVERALL | | HEAD STYLE | DOUBLE HEXAGON W/HOLE | | HEAD HEIGHT | 0.330 INCHES NOMINAL | | WIDTH BETWEEN FLATS | 0.305 INCHES MINIMUM AND | | 0.313 INCHES MAXIMUM | | EXTENDED WASHER DIAMETER | 0.438 INCHES NOMINAL | | EXTENDED WASHER THICKNESS | 0.060 INCHES MINIMUM AND | | 0.070 INCHES MAXIMUM | | HOLE CONFIGURATION STYLE | DOUBLE HEXAGON LONGITUDINAL HOLE | | HOLE TYPE | DRILLED | | HOLE QUANTITY | 4 | | HOLE DIAMETER | 0.070 INCHES NOMINAL | | GRIP LENGTH | 0.079 INCHES MINIMUM AND | | 0.099 INCHES MAXIMUM | | GRIP DIAMETER | 0.222 INCHES MINIMUM AND | | 0.232 INCHES MAXIMUM | | SPEC/STD CONTROLLING DATA | | | MANUFACTURERS CODE | 96906 | | DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | MS9218-05 |
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