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National Stock Number:
5306-01-035-1886
Federal Supply Class:
5306
National Item Identification Number:
010351886
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:
| 12008062 | 19204 | ARMY, UNITED STATES DEPARTMENT OF THE |
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Techincal Specification:
| FASTENER LENGTH | 6.750 INCHES NOMINAL | | GRIP DIAMETER | 0.9992 INCHES MINIMUM AND 0.9997 INCHES MAXIMUM | | GRIP LENGTH | 126.40 MILLIMETERS NOMINAL | | HARDNESS RATING | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL | | HEAD HEIGHT | 0.940 INCHES NOMINAL | | HEAD STYLE | HEXAGON | | MATERIAL | STEEL OVERALL | | WIDTH BETWEEN FLATS | 1.430 INCHES MINIMUM AND 1.440 INCHES MAXIMUM | | SURFACE TREATMENT | CHROMIUM GRIP | | SURFACE TREATMENT | CHROMIUM HEAD | | SURFACE TREATMENT | CADMIUM THREADS | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 1.380 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNF |
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