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National Stock Number:
5306-01-334-7911
Federal Supply Class:
5306
National Item Identification Number:
013347911
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:
| MS21297-09028 | 96906 | MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| EXTENDED WASHER THICKNESS | 0.071 INCHES MINIMUM AND 0.091 INCHES MAXIMUM | | EXTENDED WASHER DIAMETER | 1.042 INCHES NOMINAL | | FASTENER LENGTH | 2.685 INCHES MINIMUM AND 2.715 INCHES MAXIMUM | | GRIP DIAMETER | 0.5605 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM | | GRIP LENGTH | 1.740 INCHES MINIMUM AND 1.760 INCHES MAXIMUM | | HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL | | HEAD HEIGHT | 0.495 INCHES MINIMUM AND 0.515 INCHES MAXIMUM | | HEAD MINOR DIAMETER | 0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM | | HEAD STYLE | SPLINE EXTENDED WASHER | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | MATERIAL | STEEL OVERALL | | NOMINAL THREAD DIAMETER | 0.5625 INCHES | | SPECIAL FEATURES | HOLE DRILLED IN TOP CENTER OF HEAD,0.410/0.450 IN. DIA X 0.164 IN. NOMDEEP | | SURFACE FINISH | 32.0 MICROINCHES BEARING SURFACE OF HEAD | | SURFACE FINISH | 32.0 MICROINCHES GRIP | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-8837,TYPE II,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.940 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNJF | | THREAD QUANTITY PER INCH | 18 |
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