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National Stock Number:
5306-01-025-6437
Federal Supply Class:
5306
National Item Identification Number:
010256437
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:
| NAS655V25D | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE |
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Techincal Specification:
| 1.844 INCHES MAXIMUM FIRST HOLE | | SHANK UNTHREADED HOLE DIAMETER | 0.076 INCHES MINIMUM AND | | 0.086 INCHES MAXIMUM FIRST HOLE | | SPECIFICATION/STANDARD DATA | 80205-NAS655 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD | | THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.312 INCHES | | THREAD QUANTITY PER INCH | 24 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.350 INCHES MINIMUM AND | | 0.400 INCHES MAXIMUM | | FASTENER LENGTH | 1.922 INCHES MINIMUM AND | | 1.952 INCHES MAXIMUM | | MATERIAL | TITANIUM ALLOY UNS R54520 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | NAS621,COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | HEAD STYLE | HEXAGON | | HEAD HEIGHT | 0.156 INCHES MINIMUM AND | | 0.171 INCHES MAXIMUM | | WIDTH BETWEEN FLATS | 0.492 INCHES MINIMUM AND | | 0.502 INCHES MAXIMUM | | GRIP LENGTH | 1.552 INCHES MINIMUM AND | | 1.572 INCHES MAXIMUM | | GRIP DIAMETER | 0.3115 INCHES MINIMUM AND | | 0.3120 INCHES MAXIMUM | | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD | | 63.0 MICROINCHES GRIP | | 16.0 MICROINCHES THREADS | | DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER | 1.794 INCHES MINIMUM AND |
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