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National Stock Number:
5306-01-161-8179
Federal Supply Class:
5306
National Item Identification Number:
011618179
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:
| 70305-22201-102 | 78286 | SIKORSKY AIRCRAFT CORPORATION |
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Techincal Specification:
| DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.398 INCHES MINIMUM AND 1.428 INCHES MAXIMUM FIRST HOLE | | CRITICALITY CODE JUSTIFICATION | AAUR | | FASTENER LENGTH | 1.579 INCHES MINIMUM AND 1.609 INCHES MAXIMUM | | GRIP DIAMETER | 0.3115 INCHES MINIMUM AND 0.3118 INCHES MAXIMUM | | GRIP LENGTH | 1.125 INCHES NOMINAL | | HEAD HEIGHT | 0.156 INCHES MINIMUM AND 0.171 INCHES MAXIMUM | | HEAD STYLE | UNDERCUT HEXAGON | | HOLE CONFIGURATION STYLE | HEXAGON CORNERS | | HOLE DIAMETER | 0.070 INCHES NOMINAL | | HOLE QUANTITY | 3 | | HOLE TYPE | DRILLED | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE | | WIDTH BETWEEN FLATS | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.469 INCHES NOMINAL | | THREAD QUANTITY PER INCH | 24 | | THREAD SERIES DESIGNATOR | UNJF |
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