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National Stock Number:
5306-01-628-6585
Federal Supply Class:
5306
National Item Identification Number:
016286585
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:
| 74328-8-28 | 56878 | SPS TECHNOLOGIES, LLC | | AIC752-8-28 | 06725 | SPS TECHNOLOGIES, LLC | | VAL23033-8-28 | 06710 | VALLEY-TODECO, INC. | | MB84-8-28 | 73197 | HI-SHEAR CORPORATION | | ST3M571-8-28 | 76301 | THE BOEING COMPANY |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.500 INCHES | | THREAD QUANTITY PER INCH | 20 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.767 INCHES NOMINAL | | FASTENER LENGTH | 2.502 INCHES MINIMUM AND | | 2.532 INCHES MAXIMUM | | MATERIAL | STEEL COMP XM-13 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 5629 FED STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | PASSIVATE OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | AMS 2700 METHOD 1 FED STD SINGLE TREATMENT RESPONSE OVERALL | | MINIMUM TENSILE STRENGTH | 19640 POUNDS PER SQUARE INCH | | HEAD STYLE | DOUBLE HEXAGON EXTENDED WASHER | | HEAD HEIGHT | 0.504 INCHES NOMINAL | | WIDTH BETWEEN FLATS | 0.632 INCHES NOMINAL | | EXTENDED WASHER DIAMETER | 0.827 INCHES MINIMUM AND | | 0.837 INCHES MAXIMUM | | EXTENDED WASHER THICKNESS | 0.123 INCHES NOMINAL | | GRIP LENGTH | 1.750 INCHES NOMINAL | | GRIP DIAMETER | 0.4990 INCHES MINIMUM AND | | 0.4995 INCHES MAXIMUM | | POINT STYLE | FLAT | | POINT LENGTH | 0.060 INCHES NOMINAL | | POINT CHAMFER ANGLE | 45.0 DEGREES NOMINAL | | PART NAME ASSIGNED BY CONTROLLING AGENCY | BOLT, CLOSE TOLERANCE, 12 POINT, FLANGE HEAD, 220 KSI FTU, CRES |
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