5306-01-201-3792 BOLT,CLOSE TOLERANCE Index 5305-01-201-3794 SCREW,CLOSE TOLERANCE

National Stock Number:
5306-01-201-3793

Federal Supply Class:
5306

National Item Identification Number:
012013793

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.


Manufacturer Information:
BACB30LJ4U1606710VALLEY-TODECO, INC.
BACB30LJ4U1606725SPS TECHNOLOGIES, LLC
BACB30LJ4U1606950HOWMET GLOBAL FASTENING SYSTEMS INC
BACB30LJ4U160JV78J M PRECISION INC
BACB30LJ4U1617446HUCK INTERNATIONAL, INC
BACB30LJ4U1617943FEDERAL MANUFACTURING CORP
BACB30LJ4U1627624SPS TECHNOLOGIES LLC
BACB30LJ4U1680539SPS TECHNOLOGIES, LLC
BACB30LJ4U1681205THE BOEING COMPANY
BACB30LJ4U1692215HOWMET GLOBAL FASTENING SYSTEMS INC
BACB30LJ4U1697928HUCK INTL INC


Techincal Specification:
FASTENER LENGTH1.374 INCHES MINIMUM AND 1.404 INCHES MAXIMUM
GRIP DIAMETER0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
GRIP LENGTH0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM
HEAD HEIGHT0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM
HEAD STYLEUNDERCUT HEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALIRON ALLOY 660 OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES
WIDTH BETWEEN FLATS0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.364 INCHES MINIMUM AND 0.414 INCHES MAXIMUM
THREAD SERIES DESIGNATORUNF
THREAD QUANTITY PER INCH28


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