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National Stock Number:
5306-01-223-7072
Federal Supply Class:
5306
National Item Identification Number:
012237072
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:
| 1376-23-231 | 44114 | BAE SYSTEMS LAND & ARMAMENTS L.P. | | 1376-23-231 | A0199 | FINMECCANICA SPA | | 5521034 | 53711 | NAVAL SEA SYSTEMS COMMAND | | 5306PL0956386 | 9009H | INSPEKTORAT WSPARCIA SIL ZBROJNYCH |
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Techincal Specification:
| EXTERNAL THREAD TOLERANCE CLASS | 6H | | FASTENER LENGTH | 51.00 MILLIMETERS NOMINAL | | GRIP DIAMETER | 7.9750 MILLIMETERS MINIMUM AND 7.9870 MILLIMETERS MAXIMUM | | GRIP LENGTH | 37.00 MILLIMETERS NOMINAL | | HARDNESS RATING | 200.0 BRINELL STANDARD MINIMUM OVERALL AND 250.0 BRINELL STANDARD MAXIMUM OVERALL | | HEAD DIAMETER | 70.0 MILLIMETERS NOMINAL | | HEAD HEIGHT | 3.0 MILLIMETERS NOMINAL | | HEAD STYLE | HEXAGON | | LOCKING FEATURE | PATCH THREADS OR PELLET THREADS OR STRIP THREADS | | MATERIAL | STEEL OVERALL | | PROPRIETARY CHARACTERISTICS | PACS | | NOMINAL THREAD DIAMETER | 8.0 MILLIMETERS | | WIDTH BETWEEN FLATS | 17.9 MILLIMETERS MINIMUM AND 18.0 MILLIMETERS MAXIMUM | | SURFACE FINISH | 3.0 MICROMETERS BEARING SURFACE OF HEAD | | SURFACE FINISH | 3.0 MICROMETERS GRIP | | SURFACE FINISH | 3.0 MICROMETERS THREADS | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416,TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL AND CHROMATE OVERALL | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 48.5 MILLIMETERS MINIMUM AND 51.0 MILLIMETERS MAXIMUM | | THREAD SERIES DESIGNATOR | M | | THREAD PITCH IN MILLIMETERS | 1.25 |
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